Fundraising ideas please help!?

i work at a supermarket and each year we collect money for the jimmy fund. at the checkout, cashiers will ask the customer if they would like to donate a dollar to the jimmy fund, and in return they recieve a triple winner game card, which they can win free stuff in the store. On the side, we also do things like have cookouts and a book drive and a bake sale. we are looking for other simple, easy fundraising ideas we can do in lieu of the ones already listed above in order to raise more money for this great cause.