There's currently no US vendor for these wheels, which are made in England, so I believe this vendor is no longer selling them. As some have noted in previous responses here, some US vendors are still selling out the stock that they have, though I suspect that there's not much left.
You can buy them directly from the factory, here's a thread I started on how to do that.
https://www.fiestastforum.com/threads/factory-direct-source-td-pro-race-1-2s.20121/