I will see if I can help you, though I am in Texas. My family owned a 1960's & 1970's C-store chain called the Mini-Marts, partnered with Exxon, so a I know a few things, currently act as a buying expert doing "due diligence" for buyers.
My suggestion is to first contact Corp suppliers for a list of possible outlets, then ask for any downsizing opportunities. Next look up Distributors, hit each one to ask if they are selling off any properties, but my favorite method is to get friendly with these Distributors and they will offer a "maybe" opportunity. These opportunities may be clients that cannot make their gas payments and are no longer on floats, but COD.
Let me know if any of this helps out. Oh, and make sure you let Corp and Distributors know you are not a broker.