I have found that most of the Goodwill Stores post items like vintage Singer sewing machines in Craigslist and on EBay with buyer paying much more plus shipping. I stopped going to Goodwill because they do that. Other thrift and recycle centers like St Vincent DePaul and Salvation Army don't appear to sell online to get higher prices.
You found a beauty. Even if you have to buy a bobbin case and foot pedal you made out well.