What are the items you put inside a party bag without costing a bomb? I am planning a birthday party for 40 kids in pre school. Appreciate your input.

I would not put in food or snacks because I can never too sure about the other kids' dietary restrictions or what their parents would allow/won't allow their kids to eat. So I'd probably stick to stationary, little trinkets or toys that I can buy in bulk and pack them in cute bags.