I inherited my mom's machines in the meantime, and haven't bought any since I've been here. I've gotten a few...some drop them off at my shop, friend gets them in lots from when he goes to auction but generally I fix them and give them away.
I have a few I want but they are by no means necessary but I have machines that do the function already (although domestic): industrial cover stitch and button hole machine. If I can find it in an affordable range, I want a Union Special 43200g. I have a couple of machines that if I can get them cheap I'd add them, but not looking for them as such (button attaching machine, bar tack, etc...and by cheap, like $100 or under).