[Other option might be to see if a local trade school or factory might be willing to donate or sell their used machines on the cheap.]
Haven't read all replies but this one made me think -also ask some of the schools(middle or high schools) in your area- your town or neighboring ones if their Home Ec classes have machines they have replaced that they would sell-it they have replaced some perhaps they would have some to sell. As well as LQS for trade ins, or the trade schools.