Walmart also offers the National Geographic 3.5-Foot Corrugated Cardboard Tyrannosaurus Rex (pictured), model no. 68975, for $3 plus 97 cents for shipping. (Free Site-to-Store is also available.) That's $2 under our mention from last week and the lowest total price we could find by $12. It features a movable jaw and arms and can be colored to suit the owner's taste.