Maryland guys...

They're pretty reasonable. All i've gotten from them is a lugnut/locker set, some wiring and misc fittings. My buddy got an SCT tuner for his powerstroke from them with 3 custom settings for $350, which he said was the cheapest he found.
btw, Laurel is about 40 mins from Mt. Airy.
 
Check out superstallions too as there are a lot of MD guys on there. Their yearly event is coming up soon too at cecil. If I get my rollbar done soon I'll be there. You may also want to check out the NVMC northern virginia mustang club for advise on where to go too. SGS isn't too far from MD depending on where your at.