Lead Gen for Large MultiFamily Deals

Hi all and thanks in advance.

My brother and I are preparing to begin buying and syndicating large (20-100+) unit deals. We're trying to figure out ways to expand our deal leads. As of now, we have a couple of realtors in the area that show us their MLS feeds and Loopnet. We are looking to connect with more wholesalers as well. As the person tasked with lead generation, are there any other lead sources or out of the box ideas we aren't thinking of to generate more leads?

FYI: We are looking in the Eastern Oklahoma markets i.e, Tulsa, Tahlequah, Pawnee etc.