Hi, I have got some rare 3dfx for sale:
http://www.ebay.com/itm/3DFX-Voodoo-3-2000-by-Sigma-Rare-AGP-Graphics-Card/253030820408
http://www.ebay.com/itm/3DFX-Voodoo-3-2000-by-GARNET-Rare-AGP-Graphics-Card/253037895409
as well as extremely rare SiS Xabre 600:
http://www.ebay.com/itm/SiS-Xabre-600-by-Soltek-Rarer-than-3Dfx-Voodoo-5-6000-White-AGP-Graphics-card-/253037924618?hash=item3aea3c510a:g:DDgAAOSwx3NZYx-L
I will add more cards soon