You can always hold a garage or yard sale.
Many people advertise at least some of their merchandise in the classified yard sale section of the daily newspaper.
You don't need to buy online; chances are good that you can find exactly what you're looking for at a yard sale or antique store.
Extra money for the room change budget could also come from selling things like furniture, books, and clothing through a yard sale or second hand stores.
Be prepared; yard sale hunting can become addictive!