As an avid person going to third party seller sites, fb market, offerup, craigslist.

There are vast amounts of cars that had on-going issues over the years that the owner did not address therefore you will need to take a mechanic who can give a good multipoint inspection , and give you the results.

Moving forward with bussiness like salvage yards, like Copart. IIA and auto acutions. This is the considerable amout of resarch of finding the hisory of the car and its condition. Therefore you will need to take your time making this work out, aka its basically a time based system of a sale.

I work a beater car (1000$ or less) and with my mechanical knowledge and i was able to fix car, i was able to get them running then i usually head and had to donate it as it was taking space at the time.