M.B.
I would suggest talking to the manager of different stores. The manager should be able to give you an answer or will know who to ask at their company. My sister has had good luck with grocery stores because they want to get their name out and look good to the public - they might donate treats or small gift cards. Target, Wal-mart different toy stores, the Dollar Store and Card Factory Outlet/Party City would be good ones to try. There is probably a lot places like Chuckee Cheese and "kid oriented" entertainment places. I would also suggest going to a McDonald's - they tend to support a lot of children's stuff too. Good Luck!