When I search for them, it says there are none, but I just went to someones shop and they have some for sale?

http://www.subeta.ws/ushop.php?shopid=210335

I'm confused :(

There have been problems with searching for slots and random items for a long time - usually only noticeable when the Recycle beast is asking for the stuff. But now with the new achievement, its likely to become more of a problem.

Maybe because they're selling so fast and restocking so much? I was curious about this too...