Trans Intl. offers the EVGA GeForce GTX 680 2GB 256-bit PCI-Express 2.0 x16 Video Card for Mac, model no. 02G-P4-3682-KR, for $578 with free shipping. That's tied with last week's mention and the lowest total price we could find by $10. It features a 1,006MHz core clock, HDMI, DisplayPort, and dual DVI outputs.