There's a lot of rare-groove, slow, soul joints out there man and plenty of crates to dig through on YouTube... I've no money for records this month so spent a couple hours digging YouTube (first time in a while) and came away with 30+ songs I can work with over the next couple weeks.
MoZedakos gave you a couple to start with - use YouTube's search function on those names and you'll soon find a useful crate there.