I meant to reply to this a couple of weeks ago but the time just slipped by.
I grind my own meats. And I make my own sausage.
You can get a fairly inexpensive electric meat grinder - that can be used for other stuff that can't be put in a food processor - and you know exactly what is going into your ground beef, pork, lamb, turkey, etc.
I started this many years ago when I had friends who were hunters and would give me wild game and I wanted to make sausage.
Most meat grinders are sold with sausage stuffer funnels and are pretty much foolproof.
I have one made by Northern Tool but the small Deni - sold at Amazon, works quite well and doesn't take up much space.
I buy my sausage casings from this place, http://www.meatprocessingproducts.com/s ... sings.html
located in Utah.
I use the sheep casings as I have found them to be the best for tenderness and texture.