Many retailers will let you exchange equipment that you don't use anymore and get the credit which you can then use to purchase the products you require. It is also possible to place an advertisement in the local paper or online classifieds to see if there is anyone who has what you're seeking. If you do this you may find that you have something you could trade with someone who already has the product. If you're trading locally, you may be able to trade other items, such as equipment.