Save sacks from kid's meals from fast food restaurants, or buy the cute lunch sacks. Label the sacks with prices. Students are given an envelope with their name on it. They decorate their envelope. They place punch out money or run off money in their envelope.
Students select a sack to purchase, count out the correct change, and then keep what is in the sack.
If another student purchased the sack a student was about to purchase, the student must pick a different sack and count out a new amount. Another option I have used is to give each child a price tag with an addition or subtraction problem. The student must work the problem and find the correct answer, then count out that amount of money to me. If correct, the sack with that amount goes to the student. In this instance, they do not get to choose which sack to buy, it all depends upon the price tag they are handed.