There are still many around and most encourage orders if you are looking for something in particular. They can all get it!
Not very familiar with MD stores but understand there are a few good ones. In VA, my go to's are Blue Ribbon Koi, Capital Aquarium, Reef Escape and Centreville
Aquarium - primarily due to convenience. I encourage you to support our local marine/reef stores. They can get what you want, just need to have the conversation!!