Warehouse stores sell common stuff all the time, but specials are often one offs.
A company that I used to deal with got a call from Costco. Once.
Costco's pitch was that they had an empty semi trailer that could be at the dock in two weeks. Did the company have enough capacity to fill the trailer with pallets of goods that Costco could put into their stores, one pallet per store. Every pallet of goods had to be the same. A deal was struck, two trailer showed up. Both were filled and shipped out. The company never heard from Costco again. Their customers were able to buy a lot of good product at a great price, once.