Kmart offers the LEGO Chima Mammoth's Frozen Stronghold, model no. 70226, for $39.99 $40.99. Opt for in-store pickup to dodge the $6.25 shipping charge. That's the lowest total price we could find by $20 for this hard-to-find set. This 621-piece set features five minifigures with weapons and accessories, Rhino Roller with flipping function, trunk stud shooters, and rotating disk shooter.

Of note, Shop Your Way Rewards members will earn a Kmart credit with this purchase and may be eligible for additional credits and discounts.