I've mentioned before that many of my flips I got were all circumstantial deals where people HAD to sell. These deals can hit the market and sometimes you can find them on the MLS. Weirdly Facebook marketplace/group has been a decent spot to locate deals as well. Join every real estate group in your area and look. You would be surprised what pops up. Another one? This one is tricky but can work if done properly. Look for properties in pre foreclosure and try to contact the owner. Most are angry and will take it out on you. Most of the time I feel like they don't want to believe that the foreclosure will actually happen but as time gets closer to the auction date it's either sell or lose your whole house and get nothing. You can find out generally what they owe on their property too which can be helpful when negotiating/writing a offer. Many will tell you no but all it takes is one. The key here is having cash and being able to close quickly (I aim for around 1-2 weeks because usually time is of the essence in these situations. I'm rather new to this but if you ever need help let me know! I'll try my best to answer any questions I can. Also driving around making a list of potential properties that interest you and sending them a letter or calling them. Persistence with all of this is key.
Auction.com - for pre for closure homes
Been verified- for checking records and finding phone numbers.
County assessor or equivalent in your area for looking up property owners names recorded sale.