Kai's Dragon Mech Battle Pack

LEGO^® NINJAGO 71851 Kai's Dragon Mech Battle Pack

Name: LEGO® NINJAGO Kai's Dragon Mech Battle Pack 71851
Brand: LEGO
SKU: 71851
Availability: InStock

Current best price

LEGO 71851 is currently available from $9.99 incl. shipping at Amazon.com. 3 retailers compared.

View the deal at Amazon.com Compare all 3 offers

Updated November 1, 2026 at 7:00 PM EST

LEGO® NINJAGO Kai's Dragon Mech Battle Pack 71851 (1/7)

Robots

Battle Pack

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LEGO 71851 price comparison: where is it cheapest?

Prices incl. shipping to the US · Prices updated November 1, 2026 at 7:00 PM EST

$9.99 + $5.49 shipping

Books-A-Million

$19.97

$11.99 + $7.98 shipping

Lego.com

Out of stock at LEGO

Brickfact may earn a commission when you buy through a merchant link. Commissions do not determine the order of offers. How Brickfact compares prices

iFurther information

The Lego set Kai's Dragon Mech Battle Pack with the set number 71851 is part of the LEGO NINJAGO theme and is recommended for ages 6+. It was released in January 2026. It includes 3 minifigures. The model has 85 pieces, and we estimate it takes around < 1 hour to build. 65 Brickfact users have this set in their collection.

The set weighs about 11.668 kg. The box measures 12.2 x 14.1 x 4.6 cm. The recommended retail price is $9.99.

Our Brickfact Lego price comparison compares the prices of 3 shops for this set. It is currently cheapest at Amazon.com for $9.99 including shipping. That is $0.12 per piece. Unfortunately, the set is currently not available below its recommended retail price.

The Part-Out-Value (POV) is the sum of the average prices paid on bricklink.com for all parts of this set. It is about $21.44. You save around $11.45 if you buy the complete set at Amazon.com instead of the individual parts on bricklink.com. The current best offer therefore has a POV rate of 2.15: the Part-Out-Value divided by the current best price on Brickfact.

Lego 71851 product data

Set Information

Set ID

71851

Theme

NINJAGO

Pieces

Building Time

< 1 hour

Age Range

Minifigures

Availability

Release

01/2026

Retiring Status

Begin of Life (12/2027)

Price Information

RRP

$9.99

Insiders Points (for purchase at Lego)

Part Out Value

$21.44

Packaging

Weight

11.668 kg

EAN (GTIN13)

5702018031971

LEGO 71851 price history: how has the price changed?

Brickfact has been recording retailer prices since 10/12/2026. Best price so far: $14.94 (21 days ago).

Cheapest current offer in the comparison: Amazon.com at $9.99. Amazon offers are not part of the price history.

Current best price: $15.48 +55% vs. RRP
Best price since 10/12/2026: $14.94 +50% vs. RRP · 21 days ago

Lowest price per retailer (since 10/12/2026)

Since 10/12/2026, Bestbuy.com was the cheapest on 20 of 22 recorded days.

Retailer	Current	Lowest price	Date
Lego.com	–	$14.94	10/13/26
Bestbuy.com	$15.48	$15.48	11/02/26
Books-A-Million	$19.97	$19.97	11/02/26

As of: 11/02/2026, 00:00 UTC

Lowest price per day that Brickfact recorded at the retailers in the price comparison, including shipping where known – as in the comparison above. Amazon offers are not included in the price history.

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Popularity with Brickfact users

users have this set: 65
buyers in the last 12 months: 66

65 Brickfact users have Kai's Dragon Mech Battle Pack in their collection. 66 users bought it in the last 12 months.

Based on anonymized Brickfact user collections; shown only for sets with at least 10 users. As of November 1, 2026.

LEGO 71851 market value

Average sale price on secondary marketplaces – not the new price at retailers.

Current market value: $8.02
Market value vs. RRP: −19.7 % $9.99
Range: $7.53 – $8.79
Average: $7.79

Loading price history…

Minifigures from 71851 Kai's Dragon Mech Battle Pack

The Kai's Dragon Mech Battle Pack set includes 3 different minifigures, 1 of which are unique to this set. The combined value of the minifigures is $9.01, which is ~90% of the RRP of this set.

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Sora - Cat Headphones, Mask, Scabbard Armor with 1 Shoulder Pad

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$2.55

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Kai - Dragons Rising, Tunic with Dragon Head, Helmet

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#njo1040

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Unique

Building Instruction for LEGO 71851 Kai's Dragon Mech Battle Pack

Part Lists for LEGO 71851 Kai's Dragon Mech Battle Pack

Part list on Bricklink.com

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Part list on Rebrickable.com

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Part list on Brickset.com

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LEGO 71851 Frequently Asked Questions

How much does LEGO 71851 Kai's Dragon Mech Battle Pack cost?

The lowest price in the Brickfact price comparison is currently $9.99 incl. shipping at Amazon.com. The RRP is $9.99.

Where can I buy LEGO 71851 cheapest?

Brickfact compares 3 retailers. The cheapest offers: Amazon.com ($9.99), Bestbuy.com ($15.48), Books-A-Million ($19.97).

Is LEGO 71851 still available?

Yes. LEGO 71851 Kai's Dragon Mech Battle Pack is currently available at 3 retailers in our price comparison.

When was LEGO 71851 cheapest?

Since tracking began on 10/12/2026, the lowest shop price recorded by Brickfact for LEGO 71851 was $14.94 on 10/12/2026 at Lego.com, including shipping. Amazon prices are not included.