My very best buy was a Singer Featherweight the light green one at Goodwill for $7.95. The best part is I was only there because of my Mom and I found it just as it was being put out.
So I owe my Featherweight to my mom who has since passed away.
My other find was a Singer 301 - big Sister to the Featherweight for $9.99 at Visiting Nurses then a card table to go with it at a church rummage sale for $2.00!