They are very hard to come by. Within 5 years of being in business I literally on;y had one landlord who took the program, and the home went within days of the ad being posted.
Your very best bet is to grab a yellowbook and call EVERY and any agency to see if they have any in house DSS rentals. Sometimes agents have personal/private rentals that you won't find advertised. It'll be a lot of phone calls to you get a hit. Best of luck to you