Detailing supplies? I'm in southern md and I've looked everywhere. Came up with a few but there no better then autozone.
Huntingtown, Calvert County. Where I went to school near Pittsburgh we had an awesome store about 30 min away and I was there twice a week at least, I told them they needed to open one down here!
The Advance auto in La plata has a large selection of Meguires polishes. They are in the body work section not in the car care. The advance auto on 3 in upper marbolo has some groits stuff. Mainly microfiber, soap, wheel cleaner and wash mits. The car quest in Waldorf has some stuff Duragloss. I get most of my stuff from Phil at DD.
You know, sometimes, auto body paint supply stores carry compounds, pads, and other things too. For sure they will carry masking tape in several widths, paper, sand paper, etc.. Good luck, its hard to find even one place. I dont have any up here in the Seattle area, so I usually have to buy from the good places back East and pay big shipping to get it out here. Dan F