there is this but it dont have ADC but has dual DVI and is $149

http://eshop.macsales.com/item/ATI%20Technologies/630ATI96128/

or this but its over what you want to spend

http://eshop.macsales.com/item/ATI%20Technologies/100435338/

or you can find a video card and flash it from a PC to Mac firmware. sometimes you can do this allot cheaper than buying a Mac version video card.

it just depends on what you want to do