I haven't had a local option since the 1990's. B&H, Freestyle, Amazon, and sometimes Adorama or Canham (for film) have kept me stocked. You just don't wait till you run out of something to buy more.

Even in the '90's I would order Freestyle since I bought things that weren't available locally like 100' spools of film, e6 chemistry, 100 sheet boxes of paper, etc..