My mom used to do this project only with paper towel rolls, sometimes she would use the bathroom rolls, but they always had money or goodies that were pre-wrapped from the store.We never got SICK!!
My paper towel roll sits on a wooden roller stick,don't think there are many germs?I think you can get more germs from a cart/ basket at the store.The only thing I would make sure if candy is given that it's pre-wrapped from the store.Bet kids would like stickers, small or tiny puzzle & coloring books from the $1.00 stores. Have FUN!!! :)