[coredog64]

I worked in this space at the turn of the century (Cobalt Group, now part of ADP). Dealers would grant access to their (usually) ADP backends that we'd scrape for inventory and then aggregate on websites (usually their own and maybe a larger hub). Today I'd say something like FB marketplace or Craigslist does that work. Smaller dealers post their inventory to Craigslist every day (or every week) and then Craigslist is the search engine. Unfortunately, at this price point, there's not enough margin for things like delivering cars, transferring across lots, etc.