Wal-mart has a 10X6 inflatable pool for 25 bucks. I am certain that may be big enough, they also have a 9'2" x 9'2" Octagonal Inflatable Family Swimming Pool for 39 bucks. i just hope they cant get out of these. If so there are more options to choose from. But with these you will need to buy the pump separately, or maybe even use the one you already have. Just some ideas.