Yep, on the N website, it says more coming late October I believe, but I expect those to go fast as well, unless your at the right place at the right time. They still stock the NES & SNES controllers, so with that in mind, it's only a matter of supply catching up with demand. Which sadly in times of C19, who the hell knows how often or how many, or how long they'll last once they do?
Let's be honest, there are many great N64 alternatives out there, wired and wireless, that all work on the Switch, so just buy one of those to tide you over until supply gets good, and don't pay the scalpers. And I would also suggest anyone with even a mild interest in the Genesis pad, PLEASE do not buy that NA version, as that should have never even been offered. Japans is the same price roughly, and they get the 6 button pad, send NoA a message, that their Genesis pad is not welcome, or at the very least, both should have been offered. With the base 3 button pad being $40, instead of $50. And I'm sure that 6 button pad would have sold out just as fast as the N64 pad did, Damn NoA is so damn clueless 99.9% of the time.