Among the Radeon RX 7900 and GeForce RTX 40, there is no such offer.

At one time, the card started for $ 1,100

Apparently, this is the lowest price (or one of the lowest) for such an adapter since the release. Recall that the RX 6950 XT initially started at $1,100.  

Among the Radeon RX 7900 and GeForce RTX 40, there is no such offer.

For $ 656 they give the XFX Speedster Merc 319. But this is in the USA, that is, the price is excluding taxes. In Europe, the cheapest option already with taxes is given for 720 euros, and this is the Sapphire Nitro card. 

According to AMD itself, the RX 7900 XT is only 5-7% faster than the RX 6950 XT. At the same time, the cheapest RX 7900 XT will now cost $ 800. The GeForce RTX 40 line also does not offer similar price-performance ratios, since the RTX 4070 Ti will cost at least the same $ 800.