3080 will be pretty much unobtainable before the new year, as the cards are 'cheap' and many can afford one. They can't make enough to satisfy demand.
IMO the 3090 will be the only guaranteed way to get a card before Christmas, as it's priced in a way to discourage the majority from purchasing one. Even if it's only 15-20% faster than a 3080, it will still mean you get a card, and have no worry about 10GB VRAM in 4k games this and next year.
IMO we'll see comparatively many more 3090's available compared to 3080, just because Nvidia make so much more profit out of the 3090.