Raw meaty bones (RMB) you can get from most butchers, they usually give them away or charge a minimal price as they have to pay to dispose of them. RMB's are a great natural source of glucosamine and chondroitin. Most pet shops now sell frozen pet minces and you can get supplements from supermarkets or chemists.

Have a look here for some good information on raw feeding: RawFed.com Home Page