Bestway H2O Go Lil' Champ Play Center, (14' x 7') $25
Big Lots has the Bestway H2O Go Lil' Champ Play Center on sale for $25. ($61.62 on Amazon). OOS online, but check your local store and ask to physically check stock. They will hold for you.
Possible to get for $20 if you can find a $5 coupon for signing up for their Big Rewards, or $10 off if you buy two $25 + $25 = $50 - $10 coupon = $40
Good luck and stay cool.