My brother's wife got this pool toy for my DD last year. When my mom took all the grandkids to TRU to pick out a toy, my then 8YO niece picked out a pool toy called Subbie -- Clowny the fish. By battery that thing zips along in the pool. She loved it so much they decided to get one for DD. Honestly, forgot about it as DD wasn't in the pool that much. Found it again and wrapped it up from them as a birthday present (she didn't remember getting it). We tried it today at the pool, just in the little kiddie pool outside at the rec center. OMG, that thing flew around the pool and next thing you know, all the little kids are trying to catch it and running around. The other parents were asking where to get one too. If in the bigger pool, no idea if anyone could've caught it (swims way faster without the magnetic "baby") so great for older kids too. Who knew a this no-name TRU pool toy could be such a hit!
http://www.amazon.com/Clownfish-Motorized-Toy-USA-Pool/dp/B000GYWY9K/ref=sr_1_4?ie=UTF8&qid=1342381935&sr=8-4&keywords=subbies -- FYI, it comes in a penguin one too
DD -- 5YO
DS -- 3YO