Used - Very Good: MSI GeForce GTX 660 Video Card N660 TF 2GD5/OC - Newegg.com
ASUS NVIDIA GeForce GTX 660 Ti (GTX650TI-OC-2GD5) 2GB / 2GB (max) GDDR5 SDRAM PCI Express 3.0 Graphics adapter for sale online | eBay
Amazon.com: WWWFZS Graphics Card Graphics Card Fit for ASUS Video Card GTX 660 2GB 192Bit GDDR5 Graphics Cards for NVIDIA Geforce GTX660 VGA Cards Stronger Than GTX 750 Ti : Electronics
GALAXY Launches the GeForce GTX 660 GC 2GB and GTX 650 GC 1GB