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 have done a snack goodie bag for my son's full month, there is.. ovaltine small pack( from bugis party store, like bulk purchase ), sweets ( from daiso, buy a pack with like 20 small sweets in it so spread into goodie bag ), small lollipop from ntuc, jelly from ntuc, a balloon ( not blown) from daiso..