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 just celebrate my Son birthday not Long.. I buy the party bag from daiso.. Bought colouring book and Color pencil.. London cake which most of the kids love it.. Small packet Milo which I bought during Sheng Siong offer.. Some sweets and biscuit to go along too.. One goodie for kids around $3.50-$4..