The Boomtown general store is open, catering mostly to mining and adventuring needs while you're on the go.
Shop's merchandise includes:
-Mining Equipment
-Tools & Consumables (such as torches, logs, etc)
-Food
-Materials, such as coal, redstone, and glowstone
-Potions
...and a few random treasures found along the way.
Full info about the town is at
this thread.