Check the butcher shops. They usually have a scrap box with a little bit of everything. A freezer is a must as well. There are always sales in which buying in bulk or buying large amounts really saves a lot of money. Hit up the deer hunters in your area. They usually leave a lot of parts that work really well for the dogs.

The raw feeders that save the most money normally are the most creative. Heck, I even see craigslist ads where people are emptying out freezers. Best of luck. EWO