Ahem:
8800 GTX - $599
9800 GTX - $349
GTX 280 - $649
GTX 480 - $499
GTX 780 - $649
GTX 980 - $549
It is important to consider market context, though. The 8800 GTX was faster and more complex hardware than the 9800 GTX, built on an older lithography node and released almost 3 years earlier, the GTX 480 was 6 months late to the party (giving AMD and its HD 5870 complete dominance over Windows 7 and DirectX 11's launch window), commonly ran in excess of 100°C, and consumed as much power as the dual-core Radeon (the HD 5970 that had two complete 5870 cores in it), being replaced by a much better, refined GTX 580 barely 8 months after its release, and that the GTX 780 is practically a reject bin GK110 processor while the 980 was built around a much leaner, lower tier GM204 processor
On the other hand, the 4090 is going to tackle the same market segment as the 3090 and 3090 Ti today. Pressure from AMD is what may keep the price at bay, since Navi 31 will be a very strong performer, but it will not be an affordable GPU either... because we still have an ongoing semiconductor shortage and external pressure from many ills of the modern world.