Costco is a bit of a liquidator in my opinion. Although they seem to have stock on certain items all the time, there are a few that only appear for a short time, until the stock is gone, and that's it. You never see it again. Also, it's not really a department store, because they don't really have a full line of all the things you'd expect to see at a Wal-mart for example; if you go there to buy a set of pliers, they may have it or may not.