There's a 3dfx Voodoo 5 6000 AGP prototype up for sale on ebay right now. high bid is $676.

http://cgi.ebay.com/3Dfx-Voodoo-5-60...item45f0b307b4

More interesting is the sellers 3dfx collection, linked from the auction page

http://www.3dfx.ch/gallery/main.php?...g2_itemId=3851

I miss 3dfx. I'm thinking of putting together a Win 98 machine with one (if I can find a Voodoo 5 cheap) as well as my Aureal Vortex soundcard, another blast from the past.