Larry, I see there is a station in Elkridge, MD(among others).
There are other alternatives to dealing with low quality fuel other than zero decking too. I have dealt with it simply by purchasing a stock 428 lower end and installing 6x heads on it. I used the lower compression 6x's. The engine only had 8.5 to 1 compression. It was a very simple engine that you could put together in your garage without any extra machining. It was very powerful and burned the lowest octane I could throw at it without a ping. I used to take it to the track and burn Nitrous Oxide when I wanted a great time slip. Fast on the street and super fast at the track with Nitrous. It's a very dependable engine because it's still in the 69 that I sold it in. After I beat it for 5 years and now 10 years of cruisin' the owner still raves about how good it runs on the 'even worse' gas now.
