We made our first batch today. (which split because I think I filled them too much)
the casings were bought from the local butcher who looked at my OH like she was an alien and said something like" never been asked for them before" but fair play he sorted us out for a couple of quid.
The pork alas was from a supermarket which was much cheaper.
the sausages are really nice but we put too much of the seasoning in, well it is our first time.