Hi Petr, welcome to the forums.
anyone can recommend specialized store for Nordic skiing close to Wash. DC (VA, DC, MD).
Doesn't exist. There used to be one in Vienna, long shut now.
Ski Chalet and Ski Center have -some- nordic gear (not much) also.
I know REI carries some stuff and maybe Sports Authority. But a specialized store with knowledgeable staff...
Ordering from REI online then having shipped to a shop, with immediate return is a really good deal for members.
Want to purchase Skate Skis and would like to go to see some in the actual store.
Good luck. Let us know where there is one if you find it.