LEGO Arin's Spinjitzu Battle Mech (71839)

NINJAGO · 213 pieces · 2 minifigures

From £17.99 at LEGO.com UK

Retiring by 31 December 2026 (70 days left) · How we estimate

LEGO Arin's Spinjitzu Battle Mech (71839)

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Compare prices (UK)

Regular price £17.99

See it at LEGO.com UK, £17.99

Last chance: New copies of retired sets tend to get scarcer and pricier.

. Amazon offers can be third-party (marked).

Also retiring soon in NINJAGO

Price history

Lowest price today: £17.99; at LEGO.com UK
Lowest we’ve recorded: £17.99; LEGO.com UK, 8 Oct 2026
LEGO’s regular price: £17.99
Tracked since: 8 Oct 2026; 1 price change since

Price records (7)

20 October 2026 · Kidinn£18.49
13 October 2026 · Kidinn£18.99
10 October 2026 · Amazon.co.uk£17.99
10 October 2026 · Argos£18.00
8 October 2026 · The Entertainerout of stock£18.00
8 October 2026 · John Lewis£17.99
8 October 2026 · LEGO.com UK£17.99

Prices at LEGO.com UK, Amazon.co.uk, Argos, Smyths Toys, Very, John Lewis, The Entertainer and Kidinn, checked daily. A line breaks when a store was out of stock or not selling the set.

LEGO Arin's Spinjitzu Battle Mech in other countries

The lowest price today in each country where LEGO sells it, converted at the European Central Bank’s rate. Delivery across borders isn’t included: most stores only ship inside their own country.

CountryLowest priceIn GBPStore

DeutschlandBest priceSmyths Toys€10.00£8.38Smyths Toys
ÖsterreichSmyths Toys€10.00£8.38Smyths Toys
SchweizSmyths ToysCHF 10.00£9.09Smyths Toys
UK(this page)LEGO.com UK£17.99£17.99LEGO.com UK

Show all 13 countries

Exchange rates of 22 October 2026.

Resale value

What the LEGO Arin's Spinjitzu Battle Mech actually sold for on BrickLink, the LEGO-owned marketplace, in the last 6 months.

New

£8.96

Median of 8 sales (worldwide), from £7.97 to £11.83

-50% vs LEGO’s regular price (£17.99)

Used

No sales in the last 6 months.

Sales on BrickLink, updated daily (last update 23 October 2026). Sold in US dollars, shown in British Pound at the ECB rate of 22 October 2026. Few sales mean a less reliable figure.

Set details

Pieces: 213
Minifigures: 2
Ages: 7+
Released: 2025
Set number: 71839
Theme: NINJAGO
Price per piece: 8.4pat today’s lowest price
LEGO.com rating: 4.5
LEGO Insiders points: 144

LEGO Arin's Spinjitzu Battle Mech building instructions

Instructions bookletPDF, 24 MB

Official instructions from LEGO.com, free to download. The LEGO Builder app has them too, many with 3D steps. All instructions on LEGO.com

LEGO Arin's Spinjitzu Battle Mech parts list

201 pieces in 75 different parts and colors, plus 2 minifigures.

Minifigures

Arin, Black Hair and Mask
Spectral Dragonian Warrior, Ghost Lower Body

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×457909b
×459443
×468568
×487087
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×24986
×214417
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×215070
×232034
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×252107
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×260481
×261332
×263868
×264647
×273109
×278256
×279897
×285080
×292692
×299563
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×13020
×13215pr0001
×14740
×14920
×15310
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×115068
×117114
×118674
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×132059
×132802
×135633
×144728
×147456
×148267
×154383
×154384
×159900
×164799
×166909
×169858
×179846
×179896
×180431

Parts list: Rebrickable.

About the LEGO Arin's Spinjitzu Battle Mech

Ninja fans aged 7 and up can play out scenes from season 3 of the NINJAGO® Dragons Rising TV show with this LEGO® NINJAGO Arin’s Spinjitzu Battle Mech (71839) toy. This building set for kids features a NINJAGO mech with posable arms and legs, which can be tilted and twisted into different positions, a rotating torso, an opening chest to place a minifigure inside and 2 large sword accessories.

Kids can also create their own ultimate mech by swapping body parts from Arin’s Spinjitzu Battle Mech with parts from customizable mechs in the 2024 NINJAGO range (sold separately): Cole’s Elemental Earth Mech (71806), Sora’s Elemental Tech Mech (71807), Kai’s Elemental Fire Mech (71808) and Lloyd’s Elemental Power Mech (71817).

The ninja toy role-play set comes with 2 minifigures: Arin with a crystal katana sword accessory and a Spectral Dragonian Warrior with its own sword accessory, plus a Baby Riyu model for kids to role-play gripping good vs. evil battles. Set contains 213 pieces.

LEGO® NINJAGO® battle toy for kids – Arin’s Spinjitzu Battle Mech lets boys and girls aged 7 and up recreate all-action scenes from season 3 of the NINJAGO Dragons Rising TV show
Posable mech toy – Arin’s Spinjitzu Battle Mech has posable arms and legs, a torso that can rotate, an opening chest to place a minifigure inside and 2 large sword accessories
Build your own mech – Kids can mix and match body parts and weapons from this mech with customizable mechs in the 2024 NINJAGO® range (sold separately) to create their own ultimate mech figure
2 NINJAGO® minifigures – LEGO® set comes with Arin armed with a crystal katana sword accessory and a villainous Spectral Dragonian Warrior for good vs. evil battles, plus a Baby Riyu model
Fun gift idea for kids – This LEGO® adventure toy provides a fun build-and-play experience and is a small treat toy for boys and girls aged 7 and up who have a passion for ninja adventures
Bigger ninja adventures – Look out for more LEGO® NINJAGO® toys (sets sold separately) featuring dragons, temples and vehicles
A universe of LEGO® NINJAGO® toys – Extensive collection of ninja toys lets kids escape into a fantasy world for imaginative play with their ninja heroes
Measurements – Arin’s SpinjitzuBattle Mech figure in this 213-piece LEGO® NINJAGO® building set for kids stands over 6.5 in. (16 cm) tall

Description: LEGO.com.

LEGO Arin's Spinjitzu Battle Mech: FAQ

Is the LEGO Arin's Spinjitzu Battle Mech retiring?

Yes: the LEGO Arin's Spinjitzu Battle Mech is retiring soon. LEGO flags it “Retiring soon” on LEGO.com UK (it already carried the flag when we started tracking on 8 October 2026). Expect it to be gone by 31 December 2026 at the latest (70 days), possibly sooner once stock runs out. LEGO doesn’t publish exact dates: this one is our estimate.

How much is the LEGO Arin's Spinjitzu Battle Mech?

The lowest price we found today is £17.99 at LEGO.com UK, out of 5 stores selling it today (regular price £17.99). Prices change often: this page is updated every day.

Should I buy the LEGO Arin's Spinjitzu Battle Mech now or wait?

Retiring by 31 December 2026: buy it while you can. LEGO is retiring it: we expect it gone from LEGO.com UK by 31 December 2026, in 70 days. The best price today is £17.99 at LEGO.com UK, LEGO’s regular price. New copies of retired sets tend to get scarcer and pricier.