Ask students to bring in their junk mail or ask your local stores if you could have a pile of their catalogues for your classroom.
Give students a budget ($200 is a good amount) and have students imagine what they would buy for their family members if they were given this amount of money. They can then go through the catalogues to choose items for each family member, cutting, pasting & calculating the cost, and how much change they would receive at the end. Challenge them to try to get as close to the set amount as possible, without going over!
Early finishers could then create a wish list of their own.