I use a Singer 301a, bought it from a sewing machine repair service for $75. Weighs 14 lbs. has a handle for easy transport, is all metal and is very easy to maintain. It sews quieter than all the new machines in my guild. Doesn't move around on the table or vibrate and uses the same bobbin as the FW.
I have bought several machines on eBay. I really enjoy looking for them and bidding on them. Even bought one for $19.99. I had purchased a new Singer for quilting last August for $199.99 at Walmart, after a couple of months I hated it so much that I packed it away and bought the 301a. I wanted a machine that was a proven workhorse.