Perfect
My son loves it!
Retailer prices for 71815 are sorted by the latest lowest price.
Retailer pricesPrice history 71815
We check Dutch retailers every day. This graph shows the full daily-low price series we have for this set.
Daily lowest price tracked across 13 Dutch retailers. The dotted line marks LEGO's recommended retail price.
Source: daily measurement at 13 Dutch retailers, 14 Dec 2025 – 24 May 2026. RRP via LEGO.com.
| Date | Price | Retailer | Stock |
|---|---|---|---|
| €39,99 | BRICKshop | In stock | |
| €34,50 | Otten Speelgoed | In stock | |
| €34,75 | KelCha Toys | In stock | |
| €37,99 | 1001 FarmToys | In stock | |
| €37,99 | Mijn Speeleiland | In stock | |
| €37,99 | 2T Toys | In stock | |
| €34,99 | Toyhouse | In stock | |
| €39,99 | BRICKshop | In stock | |
| €34,75 | KelCha Toys | In stock | |
| €37,99 | 1001 FarmToys | In stock | |
| €37,99 | Mijn Speeleiland | In stock | |
| €37,99 | 2T Toys | In stock |
Calibrated forecast based on historical pricing, seasonal patterns and retailer behavior. Tuned conservatively: rather cautious than optimistic.
Stronger signal than most sets in this theme. Waiting is a reasonable strategy.
71815 by the numbers: price, stock and history.
For LEGO Kai's Source Dragon Battle (71815), we track 7 retailers in the Netherlands, with 7 currently in stock. The current lowest price is €34,50. Use price history and stock data to judge whether this is a good time to buy.
The LEGO® NINJAGO® Kai’s Source Dragon Battle (71815) playset helps children aged 4+ learn how to build while they enjoy exciting ninja adventures in the NINJAGO universe. This action toy features a red dragon model that children can pose by moving its jaw, head, tail, legs, and 4 wings. Children can also place a fire element in its mouth to scare villains. This LEGO building toy for children comes with 4 minifigures: Climber Kai with a katana sword accessory, Wyldfyre with a katana sword accessory, a Wolf Mask Guard with a spear, and a Wolf Mask Warrior with a sword accessory. There is also a small forest build to trap characters, a powerful shooter vehicle that can fire a large arrow, and 3 small flame elements. This ninja toy has been specially designed to provide a fun experience for children aged 4+ who are discovering the joys of building with LEGO bricks. The set comes with a Starter Brick that provides a partly constructed base to get children building quickly and with confidence.
All about this set
Background, build experience, collector context, and buying notes in one story.
For LEGO Kai's Source Dragon Battle (71815), we track 7 retailers in the Netherlands, with 7 currently in stock. The current lowest price is €34,50. Use price history and stock data to judge whether this is a good time to buy.
The LEGO® NINJAGO® Kai’s Source Dragon Battle (71815) playset helps children aged 4+ learn how to build while they enjoy exciting ninja adventures in the NINJAGO universe. This action toy features a red dragon model that children can pose by moving its jaw, head, tail, legs, and 4 wings. Children can also place a fire element in its mouth to scare villains. This LEGO building toy for children comes with 4 minifigures: Climber Kai with a katana sword accessory, Wyldfyre with a katana sword accessory, a Wolf Mask Guard with a spear, and a Wolf Mask Warrior with a sword accessory. There is also a small forest build to trap characters, a powerful shooter vehicle that can fire a large arrow, and 3 small flame elements. This ninja toy has been specially designed to provide a fun experience for children aged 4+ who are discovering the joys of building with LEGO bricks. The set comes with a Starter Brick that provides a partly constructed base to get children building quickly and with confidence.
The current lowest price is €34,50 across 7 tracked retailers.
Instructions & specifications
Dimensions, pieces, build steps, and the official PDF building instruction.
Parts inventory
Known set data around pieces and build context.
Plates Special
Plate Special 1 x 2 [Open O Top Clip]
Part ID 44861 · Red
Qty 6
Plate Special 2 x 3 with Rocks
Part ID 27261 · Black
Qty 4
Plate Special 1 x 2 with Clips Horizontal [Open O Clips]
Part ID 60470b · Bright Light Orange
Qty 2
Plate Special 1 x 2 5.9mm Centre Side Towball Socket
Part ID 14704 · Dark Bluish Gray
Qty 1
Plate Special 2 x 2 with Wheels Holder Wide [Reinforced Underside Type 2]
Part ID 39767 · Light Bluish Gray
Qty 1
Plate Special 2 x 2 with Wheels Holder Wide - Technic Pins
Part ID 47720 · Black
Qty 1
Plate Special 2 x 4 with Groove and Two Center Studs (Jumper)
Part ID 65509 · Dark Blue
Qty 1
Bracket 1 x 2 - 2 x 2 Inverted
Part ID 99207 · Black
Qty 1
Tiles Round and Curved
Tile Round 2 x 2 with Bottom Stud Holder
Part ID 14769 · Red
Qty 4
Animal / Creature Body Parts
Creature Body Part, Wing 11 x 6 with 3 Bars, Red Marble pattern
Part ID 4899pat0003 · Trans-Orange
Qty 4
Animal Body Part / Plant, Tail / Trunk / Tentacle / Tongue / Vine / Tree Branch (Long Tip)
Part ID 80497 · Black
Qty 3
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium
Part ID 87747 · Black
Qty 2
Bricks Round and Cones
Cone 1 x 1 [Top Groove]
Part ID 59900 · Trans-Purple
Qty 4
Plates
Plate 2 x 4
Part ID 3020 · Red
Qty 3
Plate 2 x 3
Part ID 3021 · Dark Red
Qty 2
Plate 2 x 3
Part ID 3021 · Black
Qty 1
Plate 2 x 2
Part ID 3022 · Dark Blue
Qty 1
Plate 2 x 8
Part ID 3034 · Dark Blue
Qty 1
Plate 1 x 4
Part ID 3710 · Red
Qty 1
Energy Effects
Wave / Flame Rounded Large with Marbled Trans-Orange Pattern
Part ID 85959pat0001 · Opal Trans-Purple
Qty 3
Bars, Ladders and Fences
Bar Holder with Clip
Part ID 11090 · Black
Qty 2
Bricks Curved
Slope Curved 2 x 2 x 2/3
Part ID 15068 · Dark Tan
Qty 2
Slope Curved 2 x 1 No Studs [1/2 Bow]
Part ID 11477 · Black
Qty 1
Slope Curved 2 x 2 x 2/3
Part ID 15068 · Sand Blue
Qty 1
Slope Curved 3 x 2 No Studs
Part ID 24309 · Red
Qty 1
Slope Curved 4 x 1 Double with No Studs
Part ID 93273 · Black
Qty 1
Minifig Shields, Weapons, & Tools
Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard]
Part ID 21459 · Pearl Gold
Qty 2
Weapon Sword with Jagged Edges and Trans-Red Flames pattern
Part ID 4924pat0001 · Pearl Titanium
Qty 1
Weapon Pike / Spear Flat End
Part ID 93789 · Flat Silver
Qty 1
Wheels and Tyres
Wheel Hard Plastic (37mm D. x 22mm), Pin Hole
Part ID 2148 · Black
Qty 2
Wheel 11 x 12 with Hole Notched for Wheels Holder Pin
Part ID 6014b · Black
Qty 2
Plants & Trees
Plant, Leaves 4 x 3
Part ID 2423 · Magenta
Qty 2
Bricks Sloped
Slope 33° 3 x 2
Part ID 3298 · Magenta
Qty 2
Slope 45° 2 x 2
Part ID 3039 · Dark Blue
Qty 1
Slope 30° 1 x 2 x 2/3
Part ID 85984 · Dark Blue
Qty 1
Slope 30° 1 x 2 x 2/3
Part ID 85984 · Magenta
Qty 1
Bricks Special
Brick Special 1 x 2 with Vertical Clip [Open O Clip]
Part ID 30237b · Black
Qty 1
Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder
Part ID 86876 · Light Bluish Gray
Qty 1
Plates Round Curved and Dishes
Plate Special 1 x 2 Rounded with 2 Open Studs
Part ID 35480 · Dark Tan
Qty 2
Dish 2 x 2 Inverted [Radar]
Part ID 4740 · Trans-Purple
Qty 2
Plate 8 x 8 with Rounded End
Part ID 41948 · Medium Nougat
Qty 1
Transportation - Land
Mudguard 2 x 4 with 2 x 2 Studs and Flared Wings
Part ID 41854 · Black
Qty 2
Plates Angled
Wedge Plate 3 x 4 with Stud Notches [Reinforced Underside]
Part ID 90194 · Red
Qty 2
Wedge Plate 2 x 4
Part ID 51739 · Dark Red
Qty 1
Tiles Special
Tile Special 1 x 2 with Handle
Part ID 2432 · Dark Blue
Qty 1
Bricks
Brick 1 x 2
Part ID 3004 · Dark Blue
Qty 1
Brick 1 x 2 x 2 with Inside Stud Holder
Part ID 3245c · White
Qty 1
Technic Bricks
Technic Brick 1 x 2 [1 Pin Hole]
Part ID 3700 · Black
Qty 1
Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate
Part ID 73109 · Red
Qty 1
Bricks Wedged
Wedge Curved 6 x 4 Triple
Part ID 43712 · Red
Qty 1
Wedge 3 x 4 [Stud Notches]
Part ID 50373 · Red
Qty 1
Wedge 4 x 4 Fractured Polygon Top
Part ID 64867 · Opal Trans-Purple
Qty 1
Hinges, Arms and Turntables
Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove
Part ID 44567b · Black
Qty 1
Projectiles / Launchers
Projectile, Arrow with Shaft, Hollow Black Rubber End
Part ID 46537 · Light Bluish Gray
Qty 1
Launcher, Brick Special 2 x 6 Spring Shooter with Light Bluish Gray Top
Part ID 49743c01 · Dark Bluish Gray
Qty 1
Technic Pins
Technic Pin with Friction Ridges Lengthwise with No Center Slots
Part ID 61332 · Black
Qty 1
Technic Pin with Friction, Bar 2L and Towball
Part ID 80477 · Dark Bluish Gray
Qty 1
Retailer reviews
Summarized retailer review data when available.
My son loves it!
good quality, my son liked it
Perfect, easy to assemble, my son is happy.
My son loves LEGO and always buys here.
This is such a cool set my son and nephew had fun for hours putting it together and playing with it immediately afterwards. Not only is it well made it’s durable and safe.
I received this product in exchange my honest review for Influenster and the Lego brand. Overall about the product: Well made set that assembles in less than two hours. The moving parts are fluid and sturdy.A solid product from Lego that is true to form and appealing. An excellent addition to the Ninjago genre. I Highly recommend this product to anybody who has a child, it made them more entertainment when assemble the product and improve their forcus and critical thinking.
We love this Lego set. My son is a huge fan of Ninjago and had so much fun building it and taking it apart and putting it back together and just playing with the set. I love that it’s a great toy to keep screen time to a minimum. Great quality and the packaging was nice. We loved it!
We recently got the LEGO Ninjago Dragon Rising-Kai’s Source Dragon Battle set for our 5 and 8 year old kids, and it was a hit! The build is straightforward and perfect for their age range. With three bags of parts, they had fun dividing them up and building separately. The dragon looks really cool once it’s complete, but the real excitement came with the cannon that can actually shoot, definitely the highlight for them! Overall, it’s a great set for some sibling teamwork and creative play.
My 6 year old son and I got to put this together for our first Lego project together. He really likes ninjago, so this was perfect. It was just the right amount of challenging while still being able to accomplish. Really like the dragons head and tail movement, and the projectile shooter on the vehicle. Great bonding time spent with this.
I received LEGO Kais Source Dragon Battle set. My kids were happy with it. My youngest is impatient since we have to take some time to build it. Typical legos and they fit other Lego kits too. Came with directions as well. As always thankful to Influenster and LEGO for allowing us the wonderful opportunity to get these battle sets.
Two things - it's over-priced, and our packet was missing vital bricks. £32 for a small dragon, 4 mini figs and some other play elements is a lot. I assume it's because some parts are unique, enabling it to be a 4+ build. But even so. Low value compared to Baby Riyu or a mech. Missing Bricks: I know I can order replacement bricks but when it's not just one small brick but a) one of the four wings and b) some of the clip plates that the wings clip onto, as well as bits of the minifig costume, it's frustrating. And not nice to have a child crying because they can't build their birthday dragon. (Not often you get to write that...) So doubly annoyed at over-priced product that hasn't delivered. Will wait for the replacement bricks, which is at least a consistently quick service.
All retailer prices
Current prices, stock and discounts per retailer.
Price context
Lowest, highest and average price for this set.
This context is based on 723 price points across 7 retailers. The chart on the page remains the full interactive source.
Price forecast
Conservative baseline for the next period.
Waiting is a reasonable strategy: the signal is stronger than many comparable sets.
FAQ & set details
Pieces, year, RRP and retailer coverage.
Quick answers about price, stock and set data.