Pat
If you want to try to make it yourself try these two sites. They not only have the recipes for venison summer suasage on their site they both have kits that have everything you will need. Eldon's site has the way to make it using a smoker and in your oven. I've tried both of these recipes and liked them both. They both have very good books and video's on sausage making too.
http://www.eldonsausage.com/
http://www.sausagemaker.com/