Kmart discounts a selection of LEGO building sets, with prices starting at $3.99. Plus, Shop Your Way Rewards members get $3 back in SYWR points on toy orders of $10 to $19.99, $5 back on $20 to $29.99, or $10 back on $30 or more. (Not a member? It's free to join.) Opt for in-store pickup to dodge shipping charges, which start at around $6, or get free shipping on orders of $49 or more. (Select items are only available for in-store pickup.) A couple of best bets, both via pickup and with comparisons factoring in the SYWR points: Of note, Shop Your Way Rewards members may be eligible for additional credits and discounts.