Almost all industrial machines are copies, either all or in part, of the original Singer 111W series of machines. Look for a Singer 111W, Consew 225, 226, 206. Pfaff 45, 145, 245, 1245. Juki makes a nice machine, Brother, Artisan, Chandler, Tacsew all make copies of the Singer. Look on E-bay and Craig's list.
No one lives forever, the trick is creating something that will.