I have this video card NVIDIA GeForce GT 120 512MB that comes stock in the current Mac Pro. It belongs to my dad, but he upgraded to the ATI card so he wanted me to sell this for him.
Price on Apple's site is $150 (based on adding a 2nd Nvidia card).
He just would like to get something out of it...so accepting offers. Price would not include shipping. It will be coming in the ATI upgrade box, so if you buy it, don't be all excited to read about it being the ATI Radeon HD 4870 512MB card.