Walmart has this K’NEX Super Cyclone Coaster Building Set on sale right now for only $19.97! My in-laws got this for my son two years ago for the holidays and it is cool! You may need to help your child set it up (make it a family project or just let them work on it until it’s built), but the final product is a lot of fun! This same set is selling for $32 at Amazon, so take advantage of this price!
Make sure that you have signed up (for free!) with UPS My Choice so that you don’t miss your packages!
(Thanks Coupon Dad!)