Was in Lidl yesterday and saw that they had the aluminium sealant gun back in stock for £3.99. I bought one of these at the beginning of the year and after fitting one of my old tubes found it great for filling small batches of sausage. If you are only making a couple of pound of sausage at a time then I can't recommend them enough, they are far easier and quicker to use than trying to force the meat through a mincer and its attachment. Plus they strip down to be cleaned very easily.
Here's a link that mentions them on here a few years back with quite a bit of praise for them - although the price has risen since then.
viewtopic.php?f=7&t=4956&hilit=lidl+sealant
Yotmon.