Excellent
My son loves it.
Retailer prices for 71804 are sorted by the latest lowest price.
Retailer pricesPrice history 71804
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 24 Dutch retailers. The dotted line marks LEGO's recommended retail price.
Source: daily measurement at 24 Dutch retailers, 14 Dec 2025 – 1 Jun 2026. RRP via LEGO.com.
| Date | Price | Retailer | Stock |
|---|---|---|---|
| €12,95 | A2Toys | In stock | |
| €14,99 | 1001 FarmToys | In stock | |
| €12,99 | 2T Toys | In stock | |
| €14,95 | SpeelGoedNL | In stock | |
| €14,99 | BRICKshop | In stock | |
| €14,95 | Made in Billund | In stock | |
| €12,95 | A2Toys | In stock | |
| €14,99 | 1001 FarmToys | In stock | |
| €14,95 | SpeelGoedNL | In stock | |
| €14,99 | BRICKshop | In stock | |
| €14,95 | Made in Billund | In stock | |
| €12,95 | A2Toys | In stock |
Calibrated forecast based on historical pricing, seasonal patterns and retailer behavior. Tuned conservatively: rather cautious than optimistic.
Signal is mixed. Small movements are more likely than a big drop.
What to know about LEGO 71804 before you buy.
For LEGO Arin's Battle Mech (71804), we track 6 retailers in the Netherlands, with 6 currently in stock. The current lowest price is €12,95. Use price history and stock data to judge whether this is a good time to buy.
Arin’s Battle Mech (71804) ninja toy lets kids aged 4+ learn to build as they join in with their ninja heroes’ attempt to save their dragon friends. This role-play action toy includes an impressive mech figure to inspire kids to recreate exciting adventures from season 2 of the NINJAGO® Dragons Rising TV show. This LEGO® set comes with 2 minifigures: Arin with a katana accessory and a Wolf Mask Warrior with a sword accessory. Arin fits in the posable mech figure, which wields a large sword and rotating blade, while the Wolf Mask Warrior can fly in a glider that has posable wings, a disc shooter and 2 spears. There’s also a brick-built crystal cave with a magic mallet inside and a weapons rack with 2 golden katana sword accessories. This ninja toy has been designed to provide a fun experience for children aged 4+ who are discovering the joy of building with LEGO bricks. The set comes with a Starter Brick: a partly constructed base that gets kids building quickly and with confidence.
All about this set
Background, build experience, collector context, and buying notes in one story.
For LEGO Arin's Battle Mech (71804), we track 6 retailers in the Netherlands, with 6 currently in stock. The current lowest price is €12,95. Use price history and stock data to judge whether this is a good time to buy.
Arin’s Battle Mech (71804) ninja toy lets kids aged 4+ learn to build as they join in with their ninja heroes’ attempt to save their dragon friends. This role-play action toy includes an impressive mech figure to inspire kids to recreate exciting adventures from season 2 of the NINJAGO® Dragons Rising TV show. This LEGO® set comes with 2 minifigures: Arin with a katana accessory and a Wolf Mask Warrior with a sword accessory. Arin fits in the posable mech figure, which wields a large sword and rotating blade, while the Wolf Mask Warrior can fly in a glider that has posable wings, a disc shooter and 2 spears. There’s also a brick-built crystal cave with a magic mallet inside and a weapons rack with 2 golden katana sword accessories. This ninja toy has been designed to provide a fun experience for children aged 4+ who are discovering the joy of building with LEGO bricks. The set comes with a Starter Brick: a partly constructed base that gets kids building quickly and with confidence.
The current lowest price is €12,95 across 6 tracked retailers.
Instructions & specifications
Dimensions, pieces, build steps, and the official PDF building instruction.
Parts inventory
Known set data around pieces and build context.
Bricks Curved
Slope Curved 4 x 1 Double with No Studs
Part ID 93273 · Dark Blue
Qty 6
Slope Curved 2 x 1 No Studs [1/2 Bow]
Part ID 11477 · Sand Blue
Qty 2
Slope Curved 2 x 2 with Lip, No Studs
Part ID 30602 · Black
Qty 2
Brick Curved, 3 x 1 with 1/3 Inverted Cutout
Part ID 70681 · Black
Qty 2
Plates Special
Plate Special 1 x 2 with Clips Horizontal [Open O Clips]
Part ID 60470b · Black
Qty 5
Plate Special 1 x 2 [Side Handle Closed Ends]
Part ID 48336 · Dark Bluish Gray
Qty 3
Plate Special 1 x 2 5.9mm Centre Side Towball Socket
Part ID 14704 · Light Bluish Gray
Qty 2
Plate Special 1 x 2 with End Towball
Part ID 22890 · Dark Bluish Gray
Qty 2
Plate Special 1 x 2 [Open O Top Clip]
Part ID 44861 · Light Bluish Gray
Qty 2
Plate Special 1 x 2 with Handle on End [Closed Ends]
Part ID 60478 · Black
Qty 2
Plate Special 1 x 2 with Clip Horizontal on Side
Part ID 11476 · Magenta
Qty 1
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
Part ID 15573 · Pearl Gold
Qty 1
Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor)
Part ID 27167 · Bright Light Orange
Qty 1
Plate Special 2 x 2 with Only 2 studs
Part ID 33909 · Black
Qty 1
Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips
Part ID 98876 · Light Bluish Gray
Qty 1
Bricks Sloped
Slope 45° 2 x 1 with Bottom Pin
Part ID 3040b · Magenta
Qty 4
Slope Inverted 45° 6 x 1 Double with 1 x 4 Recessed
Part ID 52501 · Black
Qty 1
Slope 30° 1 x 1 x 2/3 (Cheese Slope)
Part ID 54200 · Trans-Red
Qty 1
Slope 30° 1 x 1 x 2/3 (Cheese Slope)
Part ID 54200 · Trans-Red · Spare
Qty 1
Tiles Round and Curved
Tile Round 2 x 2 with Bottom Stud Holder
Part ID 14769 · Dark Purple
Qty 3
Tile Round 2 x 2 with Dragon Head, White Gear in Dark Azure Circle print
Part ID 14769pr9988 · Pearl Gold
Qty 1
Tiles Special
Tile Special 1 x 2 with Two Vertical Teeth / Tooth
Part ID 15209 · Black
Qty 3
Tile Special 2 x 3 Pentagonal
Part ID 22385 · Dark Green
Qty 1
Plates
Plate 2 x 6
Part ID 3795 · Bright Light Orange
Qty 3
Plate 2 x 3
Part ID 3021 · Bright Light Orange
Qty 1
Plate 2 x 2
Part ID 3022 · Dark Purple
Qty 1
Plate 1 x 6
Part ID 3666 · Dark Blue
Qty 1
Plates Angled
Wedge Plate 4 Stud 45° Angle Plate
Part ID 15706 · Black
Qty 2
Plate Angled 2 x 2 with Step and Hole in Center
Part ID 79846 · Dark Green
Qty 2
Wedge Plate 4 x 6 Cut Corners
Part ID 32059 · Black
Qty 1
Wedge Plate 2 x 4
Part ID 51739 · Black
Qty 1
Wedge Plate 4 x 8 Cut Corners
Part ID 68297 · Dark Tan
Qty 1
Animal / Creature Body Parts
Creature Body Part, Barb Large (Claw, Talon) with Clip
Part ID 16770 · Black
Qty 2
Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section
Part ID 40379 · Black
Qty 1
Minifig Shields, Weapons, & Tools
Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard]
Part ID 21459 · Pearl Gold
Qty 2
Weapon Pike / Spear Flat End
Part ID 93789 · Flat Silver
Qty 2
Shield Round Bowed with Gold Dragon, Red Eyes, Fans print
Part ID 75902pr0022 · Pearl Gold
Qty 1
Weapon Sword / Khopesh
Part ID 93247 · Flat Silver
Qty 1
Weapon Sword, Big Blade with Bar
Part ID 98137 · Pearl Gold
Qty 1
Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard]
Part ID 21459 · Pearl Gold · Spare
Qty 1
Bricks
Brick 1 x 2
Part ID 3004 · Magenta
Qty 2
Tiles
Tile 2 x 2 with Groove
Part ID 3068b · Bright Light Orange
Qty 2
Bricks Wedged
Wedge Curved 2 x 3 x 2/3 Two Studs, Wing End
Part ID 47456 · Pearl Gold
Qty 2
Wedge 4 x 4 Fractured Polygon Top
Part ID 64867 · Opal Trans-Purple
Qty 1
Plates Round Curved and Dishes
Plate Round Corners 2 x 6 Double
Part ID 18980 · Black
Qty 1
Plants & Trees
Plant, Leaves 4 x 3
Part ID 2423 · Magenta
Qty 1
Transportation - Land
Wheel Arch, Mudguard 3 x 4 with 2 x 2 Plate
Part ID 28326 · Dark Bluish Gray
Qty 1
Mech Leg, Right, with Black Pin
Part ID 70943c01 · Bright Light Orange
Qty 1
Mech Leg, Left, with Black Pin
Part ID 70946c01 · Bright Light Orange
Qty 1
Rock
Rock 1 x 1 Crystal 5 Point
Part ID 30385 · Opal Trans-Purple
Qty 1
Rock Panel 2 x 4 x 6
Part ID 47847 · Dark Blue
Qty 1
Bricks Round and Cones
Brick Round 1 x 1 Open Stud
Part ID 3062b · Magenta
Qty 1
Technic Pins
Technic Pin without Friction Ridges Lengthwise
Part ID 3673 · Yellow
Qty 1
Technic Pin with Friction Ridges Lengthwise with No Center Slots
Part ID 61332 · Black
Qty 1
Technic Pin without Friction Ridges Lengthwise
Part ID 3673 · Yellow · Spare
Qty 1
Technic Pin with Friction Ridges Lengthwise with No Center Slots
Part ID 61332 · Black · Spare
Qty 1
Technic Bricks
Technic Brick 1 x 2 [1 Pin Hole]
Part ID 3700 · Dark Bluish Gray
Qty 1
Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate
Part ID 73109 · Light Bluish Gray
Qty 1
Bars, Ladders and Fences
Bar 1 x 4 x 2 with Studs
Part ID 4083 · Black
Qty 1
Bar 3L
Part ID 87994 · Pearl Gold
Qty 1
Bar 3L
Part ID 87994 · Pearl Gold · Spare
Qty 1
Large Buildable Figures
Large Figure Weapon 6 Blade Ninja Star / Shuriken
Part ID 41125 · Pearl Gold
Qty 1
Bricks Special
Brick Special 1 x 1 with Studs on 2 Sides
Part ID 47905 · Black
Qty 1
Technic Special
Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets
Part ID 48172 · Black
Qty 1
Projectiles / Launchers
Launcher, Brick Special 1 x 4 with Inside Clips (Disk Shooter)
Part ID 63783 · Light Bluish Gray
Qty 1
Retailer reviews
Summarized retailer review data when available.
My son loves it.
This set is perfect for children aged 4 and up: easy to build thanks to the starter brick, but still exciting with the moving mech, large sword, and cool details like the rotating blade arm. The two minifigures (Arin and Wolf Mask Warrior) are beautifully designed and provide great opportunities for role-playing. A great gift for the price!
The LEGO gift that my children wanted. As advertised. Arrived on time and the package was in perfect condition.
As shown in the picture.
This was a nice smaller set for me and my son to build together. He is only 3 but was able to assist with some of the build. He enjoys playing with the set and it was a good bonding experience I get to share with him.
when we got this, my son was so excited to open it and it was such an easy assembling process. I was actually shocked the quality of the toys was really good. Very durable, and does not fall apart easy when being thrown around
My daughter is a huge fan of Lego sets and this one is alot of fun. The directions are easy to follow with large photos. All the pieces we're enclosed and easy to find. She picked out another box similar to this one on our last shopping trip. Thank you for providing a quality product.
This is so much fun for my daughter she loved building. The directions are super easy for you to follow. The one bad thing was that I had 2 pieces missing so that kind of sucked.
My daughter absolutely loved these legos! They came with amazing instruction booklets if you wanted to build characters advertised on the packaging! She also really loved to free build to! These legos were a hit!
My son is obsessed with legos and he was so happy to receive it. He opened it immediately and put it together in about an hour. The final results were amazing!
The little boy thought it was fantastic.
The child will receive this as a birthday gift and has specifically requested it. It will be exciting to see his reaction!
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 1513 price points across 6 retailers. The chart on the page remains the full interactive source.
Price forecast
Conservative baseline for the next period.
The signal is mixed. Small movements are more likely than a large drop.
FAQ & set details
Pieces, year, RRP and retailer coverage.
Quick answers about price, stock and set data.