Give me a break. People are missing the point here. Nvidia could have very easily bought the technology and the people (they hired 100 engineers from what I read) WHILE agreeing to provide warranty service and minimal driver support for the old Voodoo lines. Warranty service would be a piece of cake with the old inventory from 3dfx (which I believe WAS purchased by Nvidia, chip stockpiles were at least).
As it is, drivers, warranties, and current card stock will disappear. By providing warranties and minimal driver support, Nvidia could have squeezed money out of the remaining 3dfx cards floating around. Instead, their value disappears overnight. I don't think Best Buy is wrong for pulling the cards, especially if they will receive their money back when they are returned.
3dfx was between a rock and a hard place. Either they sold piecemeal to Nvidia, or they went into bankruptcy liquidation and would be purchased by Nvidia anyway, for less money. They took the controlled implosion route, which is much wiser.
3dfx made an enormous mistake in ignoring business and OEM customers while focusing on retail sales. Your average computer Joe is not going to buy an aftermarket part for his pre-built HP machine, even assuming you could put a new card into those propietary boxes. They should have stayed in the chip manufacturing business and left the card development to CL, Hercules (oops, gone!), STB, and various others. Not only did 3dfx die, but STB was taken down, too, if only in spirit now.
Bad year for computer component manufacturers -- Diamond, S3 (video), Hercules, Aureal then 3dfx. A littered battlefield of fallen companies!