Walmart offers the Playhut Paw Patrol 2-in-1 Tent for $14.99. (Toys"R"Us charges the same.) Opt for in-store pickup to dodge the $5.99 shipping fee. That's tied with our March mention and the lowest price we could find by $10. It fits a twin mattress.

Update: Walmart is now out of stock; however, Toys "R" Us still offers it for the same price with in-store pickup.