3dfx cards are getting close to the original asking price.
Some rare ones even already excede it.
Super Socket 7 mainboards have also become expensive. They used to be pretty cheap, while the high end CPUs were expensive.
It all changed when the pile of NOS K6-2+ 570MHz surfaced and the K6-2+ to K6-3+ mod was discovered. Now the CPUs are dirt cheap and the demand for SS7 boards has risen.
Then there are highend sound cards like Adlib and Gravis Ultrasound, who also have exceded the original asking price.
Even hardware from this century can be more expensive than it used to be when it was new.
A fine example for this: Late 2000s mainboard with AGP slot from ASRock. These bizarre pieces make it possible to combine AGP cards with 4GHz quadcores (Phenom X4 or Core 2 Extreme), highend DDR2 and SATA SSDs. No SATA to IDE adapter required. Some even have SATA2. Or a PCIe slot in addition to AGP, so you can use the PCIe slot for a SATA 6GB/s controller card.
These boards were low budget and came with shitty caps. So they were thrown away en masse during the 2010s. Now the supply is rather slim. I've seen them sell for three times (!) the original asking price.
If you want the best of the best, you'll either spend a shitton of money or spend a lot of time hunting for bargains.