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Be better to buy a meat grinder(either a hand powered one or electric. Crappy Tire or any small appliance place. Hand griders start at $21. Electric at about $130) and do it yourself. Collagen casings for 20 pounds runs $10. http://thespicysausage.com/index.html
There are lots of recipes and how-to's on line. 1,720,000 sites come up on a Yahoo search.
When I read the thread on how much guys pay to process their deer, and have sausage made, I realized if I did not do it myself, I could not afford to hunt and eat my game.