This is a sports collectibles store, although they also have jerseys, t-shirts and caps for many teams.
They have very few unique items, but they do have some very nice and somewhat less common items on display (and of course for sale). Prices are reasonable given the state of the collectibles market.
Baseball-related items tend to dominate the collection, but they also have football, hockey and some basketball items. it's a decent place to browse, but I seldom buy anything here.