They're very limited in quantity right now, but they're still being manufactured.
Keep in mind there's a semiconductor shortage right now that effecting every company, not just 8bitdo.
Your best bet to snag one would be to head over to r/AnalogueInc and there's a thread there about when they're available. However, when they are available, they go quickly.
I was able to get a 2.4ghz N30 last night, and they were sold out again pretty much instantly.
8bitdo is selling them in the US through their Amazon store. They're not shipping to the US through their Alibaba store. They're also restricting them to 1 per account.
Here's the links to their Amazon product pages