I use Butchers & Packers. Full product range, online ordering, fast delivery, fair prices.
LOL.... go figure! http://www.butcher-packer.com/
Second part, I highly recommend you do chicken sausages first. Meat is the cheapest to practice with, readily available and it makes you pay specific attention to the meat temperature which is extremely important in making sausages.
If you use the same device for both grinding and stuffing, re-chill/freeze it between stages. Cold is important!
Lastly, I highly recommend using Pop's breakfast sausage recipe from here and make a small batch. It WILL be good, its about the only sausage everyone here on the boards agrees on.
Richie has some good sausages, there are load's of great recipes on the boards.
Good luck and don't get all anal about your first couple a runs, its just getting familar with the equip and safety practices.
Have fun. They did tell you its addictive right? Good to go and meet you butcher personally....LOL