I picked up a RTX 3090 FE in October. When NVidia dumped their store to best buy, the cards were available for quite some time that day. I was able to get an order through. Think I'll just stick with it at this point.
Don't exactly know when more cards will be available, but here is the link to the and store where the black 6800xt is being sold. I am also trying to buy one of these but it seems impossible since there are thousands who want to buy it as well. Good luck and check every Thursday at around 2:00 PM.
1. Its the 6800XT but fully blacked out, just a different styling.
2. You would want to buy one because you like the look better, or want the limited edition card.