Forecast Model

This represents the expected annual growth (CAGR) based on a forecast model only.
42121 Heavy Duty Excavator is a 569 piece Technic set released in 2021. While the MSRP is $39.99, the current average price on the secondary markets is around $37. Once retired, the expected annual growth will be close to 5% after the second year, which will value the set bewteen $45 and $48 shortly after it is retired.

For Sale (New/Sealed)

(US) *** Best US listing for Heavy Duty Excavator ***
BrickEconomy Choice
$39.99
(VN) Technic Heavy-Duty Excavator 42121
$36.89
-7.8%
(US) Offical set 42121 Technic Heavy Duty Excavator at LEGO.com
$39.99
(US) Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday or Anytime Gift ...
$39.99
(US) Technic Heavy-Duty Excavator 42121
$39.99
(US) Technic Heavy-Duty Excavator (42121) Brand New & Sealed
$42.50
+6.3%
(US) Technic Heavy-Duty Excavator - 42121
$45.95
+14.9%
(US) Brand new in sealed box, ready to ship!
$46.98
+17.5%
(US) NEW! In sealed box. Box is mint. RRP-$39.99
$46.99
+17.5%
(US) BrickLink store BrickLover4Life
$49.99
+25.0%
(US) Technic Heavy-Duty Excavator 42121 Building Kit Brand New 2021 Kid Toy Gift
$55.95
+39.9%
Show 19 more listings

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Looking for a special gift for kids who love construction toy sets? This 2-in-1 LEGO® Technic™ Heavy-Duty Excavator (42121) toy has plenty of features for hours of creative play. Boys and girls aged 8 and up will enjoy an immersive building challenge before exploring the digger toy's realistic features.

See how an excavator works
Digging, driving, rotating; there's so much to discover in this cool kids' excavator toy. Check out the shovel that moves up and down, plus the movable arm, running belts and rotating body. There’s also a detailed cabin with a driver’s seat and control panel. The set comes with extra LEGO brick ‘stones’ to dig and 4 cones. When it’s time for a new challenge, the model rebuilds into a tracked tractor with backhoe.

Packed with realistic features, this digger toy set lets kids see how construction vehicles really work. Check out the moving shovel and arm, plus running belts, just like on a real excavator.
When kids are ready for a new challenge, the...
Description provided by LEGO©