I've actually found three working sewing machines from the 60s and 50s
A singer slant-o-matic and a Kenmore 52. I don't remember the third one I bought. All of them total were less than 30 dollars :-D Search the salvation army. The only issue is the Singer was used without cams (big no no) so it only sews straight - but that shouldn't be a costly repair. My slant-o-matic booklet says "most lightweight machine" and it is HEAVY as hell, but the newer kenmore 52 is even heavier. Thank jeebus it came in a sewing table.