Did you get a flier in the mail from JC Penny? These come periodically, and usually it's a coupon good for $10 off any $10 purchase. So basically, they'll let you go in, pick something out for under $10, and walk away paying nothing!
When you go to use your coupon, check out the kids toys and look for children's play tents that are on clearance. These are regularly priced at around $60 but are marked down to less than $20. When you put your coupon toward the cost, you should be able to pay less than $10 for a really nice tent!