leileilol wrote:It was recalled?
I know the card is a blowhard, but really?
AFAIK, and perhaps sliderider knows more, nVidia had retailers send unsold stock back at some point after release. There are also weren't may 5800Us built to begin with - I've heard estimates as low as 100,000 total NV30s, and the majority of those ended up on Quadro FX 1000 and 2000 boards for OEM customers, and then the next biggest block ended up on vanilla FX 5800s. FWIR the yields were fairly bad in general, and cores that could actually hit 500MHz were even less common (and 5800Us aren't known as great overclockers either - the HWBOT average is 528MHz, and most reviewers back in the day were only hitting 520-530; I forget exactly what mine did with Coolbits, but it was somewhere in that neighborhood).
To the OP's request: there have been a couple of 5800Us spotted in the "ebay auctions, special for you/me" thread in the last few months. One of them was a claimed pre-production/review sample (which I seriously doubt, based on its appearance) and sold for some hilarious sum (over $200 US), another was sold DOA for under $20. They're not extremely common cards (and do seem to sell fairly quickly), but they're not as rare as something like Voodoo5 6000. I'm sure there are other places they crop up from time to time too, maybe also look at places like Amibay and other online auction sites.
The easiest path to an NV30 would be Quadro FX 2000, which has the added bonus of dual-link DVI (which the GeForce FX cards don't feature). Those are fairly cheap (generally under $50 US) and common on ebay, and will offer performance similar to the FX 5800. The Quadro FX 1000 is also NV30-based, and will perform similarly to the 5800 Ultra in idle/low-power clocks (the 5800U will run like this in a lot of older games). I'm not sure if they support the same 16x MSAA that the NV35-based Quadro FX cards have, but that might be another bonus.