We have a sausage stuffer from Northern tools
northerntooluk.comand it works very well. We've probably made over 100lbs of sausages with it in the past few years. We broke the handle shaft at one point (misused) and a spare part was easily available.
We get sausage casings and seasonings from Scobies
scobiesdirect.com and have found them to be a good supplier of butchers sundries.
We usually use the "superfry" casings as they are dry, and easy to store, and keep for ages.
Don't be tempted by the mincer attatchment stuffers, they are neither one thing nor the other and are very slow too.
Hope you have fun with you sausages!
Dave