I began looking for a set of 9mm Luger dies several months ago, and everybody was out, and backordered. After weeks of frustration I picked a couple of dealers and started checking their websites several times a day.
One day I checked Cabela's, who had been out for forever, and they listed them "in stock". And at a reasonable price. I ordered them immediately, and got an order confirmation.
Two hours later I checked their website again, and they were "out of stock".
You just have to be persistent.