Ages 7+

Arin's Spinjitzu Battle Mech (71839)

Name: Arin's Spinjitzu Battle Mech
Brand: LEGO
SKU: 71839
Rating: 4.6 (4 reviews)

Prices last checked: 30 April 2026 at 18:29

LEGO.com RRP:

£17.99

Best Price Found

€13.71(~£11.52) -£4.50 (25%)

View Deal →

Amazon DE// Last Checked: 25 Apr

LEGO.com

★4.6

(4 reviews)

★4.6

🧱 213 pieces - : £0.06

Available From

£13.49

£17.99

Free delivery

Save £4.50 (25% off)

Price checked: 30 Apr 2026

View Deal →

Best Deal

€13.71(~£11.52)

Free delivery with Prime

Price checked: 25 Apr 2026

View Deal →

€13.99(~£11.75)

Price checked: 21 Apr 2026

View Deal →

£18.00

Price checked: 30 Apr 2026

View Deal →

LEGO.comOfficial

£17.99

Price updated: 30 Apr 2026

View on LEGO →

Building Instructions Brickset

Price Analysis

Lowest Price Ever

£6.54

at Amazon UK · Jan 2026

Average Price (12mo)

£14.03

Current vs Average

-3.8%

Below average

Price Trend

Falling

Last 30 days

Best Month to Buy

April

Value Score

10.0/10

Price-per-piece vs theme avg

The lowest price we've recorded for Arin's Spinjitzu Battle Mech is £6.54 at Amazon UK in January 2026. The current price is 3.8% below the 12-month average of £14.03. Prices have been trending downward recently — a good time to buy. Historically, April tends to offer the best prices for this set.

Price History & Buying Verdict

VerdictWorth watching

•Prices have trended downward over the last 30 days — there's a chance of a further dip.
•On price-per-piece, this is one of the better-value sets in the NINJAGO® range (value score 10.0/10 vs theme average).
•A recent price drop of about £4.40 was recorded in the last 30 days.

We've been tracking the price of LEGO NINJAGO® Arin's Spinjitzu Battle Mech (213 pieces) for 106 days, recording 103 data points across LEGO.com and major UK retailers. Over that period the price has dropped 8 times below previous levels, with the lowest price ever recorded being £6.54 at Amazon UK in January 2026.

The 12-month average sale price for set 71839 works out to £14.03 — that's 22% below the LEGO RRP of £17.99. The highest price we recorded across our tracked retailers was £18.00, giving a range of about £11.46 between the cheapest and most expensive observation.

Amazon UK has run the most price drops on this set in the period we've tracked, making it the retailer most worth watching for short-term deals. Historically, April has produced the lowest average prices for Arin's Spinjitzu Battle Mech, so if you're not in a hurry it's worth bookmarking the page closer to that window. Prices have been trending downward over the last 30 days.

Want to see how LEGO Arin's Spinjitzu Battle Mech (set 71839) compares against other sets? Browse the best-value LEGO sets or check the full price-history tracker.

Description

Arin's Spinjitzu Battle Mech (71839) is a LEGO NINJAGO® set with 213 pieces, with an RRP of £17.99. It's currently available from £11.52 at Amazon DE — 25% below the RRP, saving you £4.50. Prices have been falling over the last 30 days. With a value score of 10.0/10, this set offers excellent value compared to other NINJAGO® sets.

Ninja fans aged 7 and over 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 customisable 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.

Features

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

Frequently Asked Questions about Arin's Spinjitzu Battle Mech

What is the best price for LEGO Arin's Spinjitzu Battle Mech (Set 71839)?

The best current price for LEGO Arin's Spinjitzu Battle Mech (Set #71839) is £13.71 at Amazon DE. This is £4.50 cheaper than the official LEGO RRP of £17.99. Price last verified on 25 April 2026.

How much can I save on LEGO Arin's Spinjitzu Battle Mech?

You can save £4.50 (25% off) on LEGO Arin's Spinjitzu Battle Mech by buying from Amazon DE instead of LEGO.com. The official RRP is £17.99, but you can get it for just £13.71. Browse more top discounts.

How many pieces are in LEGO set 71839?

LEGO Arin's Spinjitzu Battle Mech (Set #71839) contains 213 pieces. At the best available price of £13.71, that works out to approximately 6.4p per piece.

What age is LEGO Arin's Spinjitzu Battle Mech suitable for?

LEGO Arin's Spinjitzu Battle Mech (Set #71839) is recommended for ages 7+. This set is part of the LEGO NINJAGO® theme. View all NINJAGO® sets and deals.

Where can I find the building instructions for LEGO Arin's Spinjitzu Battle Mech?

You can download the official building instructions for LEGO Arin's Spinjitzu Battle Mech (Set #71839) for free from LEGO.com. Download the building instructions here. The instructions are available as a PDF and can be viewed on any device.

Where can I buy LEGO Arin's Spinjitzu Battle Mech in the UK?

LEGO Arin's Spinjitzu Battle Mech (Set #71839) is available from 4 UK retailers including Amazon UK, Amazon DE, Amazon FR and others. Prices range from £13.49 to £18.00. It's also available directly from LEGO.com at £17.99.

Is LEGO Arin's Spinjitzu Battle Mech on sale right now?

Yes! While not on sale at LEGO.com, you can get LEGO Arin's Spinjitzu Battle Mech for £13.71 at Amazon DE - that's 25% below the official RRP of £17.99. Browse more best offers.

What is the lowest price ever recorded for LEGO Arin's Spinjitzu Battle Mech?

The lowest price we've recorded for LEGO Arin's Spinjitzu Battle Mech (Set #71839) is £6.54 at Amazon UK in January 2026. That's 64% off the LEGO RRP of £17.99. Track the latest movements on our LEGO price history page.

Is LEGO Arin's Spinjitzu Battle Mech good value for money?

Comparing piece-count to price across the LEGO NINJAGO® theme, this set scores 10.0 / 10 for value. That works out to about 6.4p per piece. That puts Arin's Spinjitzu Battle Mech in the top tier of NINJAGO® sets for raw build value — you're paying noticeably less per brick than the theme average. Compare against other contenders on our best-value LEGO sets page.