Slider Bun Pan Wanted

Several years ago I bought a specialized pan from King Arthur for making slider buns. They called it a "mini-bun" pan.

Wanted to experiment before going overboard, so just ordered the one. Within a week I knew I needed at least one more. Alas, it was out of stock and back-ordered. And remained so for many months, until KA apparently dropped it.

So, does anyone know where such pans are available?