Almost all my saws have been, free.
Look at shops with BAD service depts. Those that will sell you a OEM P/C kit but won't do a vac/pres test.
Craigs has been good to me. A 056M that just needed oiler work, with a clean 026 that had a roached piston, new 20" ES bar, several chains: $50
My first 038M, from a logger friend. Free. It had sawdust in the recoil and carb. But piston/cyl looked neewby. It was worth a new 25" ES bar and I still have it.
A couple 038S from landscape friend. Siezed, but free. Those were my first 038S to 038M conversions. First one was expensive, as it had a NOS parts including P/C kit, but under $300 with all NOS parts. It runs like a naked ape.
Last score was CL, a 064, 028S, 024S and 026. The 064 was the prize but it is early vintage and still needs ignition parts, but has HD AF and is complete. 028S is missing some parts but mint mahle P/C. The 024S/026 could be runners but will make good parts saws. That was expensive at $150.
My first 036 was $100 from a friend in need out of cash. The second 036 was a seized/free. That got cleaned up with help from AS. All NOS parts and almost new condition. Before the site crashed there were some pics on that project, that helped some here.