Some low cost ideas for a classroom reward are an extra recess, or extra gym time with organized games or a dance party. For bigger fundraisers we have lots of success with renting a limo and taking kids to lunch, or renting several large inflatables and having a party in the gym.
Our school does a lot of contests as a way of getting the kids excited about fundraisers and they are usually classroom-based. My struggle is that we seem to be doing the same prizes over and over (pizza, ice cream, cookies, etc.) and they generally revolve around food (not super healthy either, although the kids love them!). We also do a lot of "dress-up" days. Does anyone have any ideas that your school uses for classroom prizes (or special event or treat - not food - but something special) that are inexpensive, easy and well received by the kids? thanks!!