Two EVGA GTX 580 graphics cards for sale (3GB version). Model #:03G-P3-1584-AR. More information here (https://www.evga.com/Products/Specs/GPU.aspx?pn=B90FE1A4-C0E1-40D1-AB9C-4D3BBE3B077F)

If you buy two, I would also throw in an EVGA SLI cable. I've been using these two cards in an SLI setup, and they can handle any game at 1080p. For 100 bucks, you can play any game in HD, I think that's pretty sweet :)

They are also good for a bit of machine learning. Combined they have a processing power of 3 TFLOPs (GTX 1080 has 8 Tflops) and 6GB of memory.

Pick up in Stanford. Also check out my ad for Corsair Memory, buy them together and I'll take a few bucks off.