If you want the best latency device that plugs into a snes and in the sfc colorway, you’d want this.
Transparent Edition - ASIN: B092DXQYDK - https://www.amazon.com/8Bitdo-Wireless-Gamepad-Original-Transparent-nintendo/dp/B092DXQYDK/
SF Edition - ASIN: B08536V3PH - https://www.amazon.com/8Bitdo-SN30-Wireless-Gamepad-Original-nintendo/dp/B08536V3PH/
SN Edition - ASIN: B08536VCZL - https://www.amazon.com/8Bitdo-SN30-Wireless-Gamepad-Original-nintendo/dp/B08536VCZL/
I missed it I guess. I checked last night too!
8Bitdo SN30 2.4G Wireless Gamepad for Original SNES/SFC (SF Edition) - Super NES https://www.amazon.com/dp/B08536V3PH/ref=cm_sw_r_cp_api_glt_fabc_92GMEHR1Y41D7FCKJRRE
If your budget is 400 USD and you have a CRT TV, then I would go for a used Super Nintendo (preferably a 1CHIP version) + FXPak Pro.
If you want to make something for a newer LED TV, then wait for a Super NT + FXPak Pro.
In both cases, I would suggest that you buy these wireless controllers from 8bitdo:
They are really affordable, convenient because they are wireless, and feel the same like the original controllers. That was one of the best purchases in my life.
Otherwise, make a cheap retro pie setup on a raspberry pie. Again there are 8bitdo controllers that you could use with that kind of setup as well, look them up on their website.
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