Craigslist and facebook marketplace are the first two that come to mind.

Facebook market place is a place where I got many people asking but no one is serious.

So (in my opinion) they are financially misaligned on long-term performance (and I think this is why there are so many people who have had bad turnkey experiences) And, as someone who has done lots of rehabs directly myself, I have seen hundreds of ways that turnkey operator could take shortcuts (to the detriment of the investor but beneficial to their bottom line) which investor could never detect (or not until years later when it's too late).

If you go on FB marketplace, you could get it for $6-7k. 

Many of the groups on Facebook have a good amount of investors that are local to your marketplace.

That's going to be tough in a high price, higher interest marketplace.

Of course zillow, apartments.com, facebook marketplace, Craiglist etc would be helpful as well. 

We also search, vet, and hire small contractors from FB market place.

., are hard to detect in textsApologies

I recommend setting up keyword alerts for each area as they are discussed in the forums daily with advertisements posted in the BiggerPockets marketplace hourly.One thing to note when looking at the individual markets, you can make or lose money in any market.