I would mention to the parents that you were thinking of taking the kids to the zoo and wanted to know if they would please send in the $ for admission. I would also have to check with parents and ask their permission of course, would have to schedule the trip around the children who could or couldnt go. Do you ever do fundraisers? every year I do two fundraisers to help raise money for just that type of thing. or preschool cost, playground equiptment, supplies...anything to help myself and the parents to cut costs. One year we managed to raise over 600$ for a little girl whose Daddy had cancer, we helped send them to Disney before he got too sick! Fundraisers are an awsome way to get good money for much needed things.!!!