This has happened in a few of my recent games. While playing with the City expansion, the Armoury Shop space was covered by a terrain card. It's perfectly clear that no one can now visit the Armoury to buy anything, but is the Armuory shop deck still available for other City encounter cards such as the Black Market?

My first inclination is no, but then again we are talking the black market where anything is possibly available. There is always the possibility the armoury could pop again in the game too. So my final thought would be to allow it if the cards were available.

Before the armoury went out of business, closed down and was turned into a desert those weapons had to go somewhere....lol

The question is asked because the Armoury sells items from the Armoury Deck. I don't think you would have asked the same question if all decks had names that differed from the shop where they are available, such as the Potions that are purchased at the Apothecary or the Pets that are sold at the Menagerie.

Shop decks and spaces where their cards are available for purchase have no relation at all. If a Terrain Card is placed on the Village, the Purchase cards would still be available on the Market Adventure card, even though the Blacksmith is gone.