Uhhh I know like Amazon has ‘em. I got mine from a vendor at PAX Prime. But it’s not the first time I’ve seen them… I wish I was of better help.
(If you actually do happen to be at PAX tomorrow they were next to Blizzard and HyperX selling them by the cash register. They were kind of hidden and I missed them completely yesterday because you had to be at the cash register to see them. They are the vendor selling old game cartridges dating back to NES and small plushies.)