GMK is really in a league of their own, and there's nothing that's quite as good, if you want ABS Cherry-profile keycaps. That being said, there are plenty of in stock keycaps on Amazon these days and a lot of them are very good. I recently bought a couple of sets of Mistel doubleshot PBT keycaps, and for half the price of GMKs, I have no issues. They're nearly perfect. You should also check WASD Keyboards and Originative. Sometimes they have GMK sets in stock.
