NeweggBusiness - EVGA GeForce GTX 660 Ti 2GB GDDR5 PCI Express 3.0 x16 SLI Support Video Card 02G-P4-3660-KR
ASUS GTX660-DC2O-2GD5 G-SYNC Support GeForce GTX 660 2GB 192-Bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card GPUs / Video Graphics Cards - Newegg.com
GTX 660 | ZOTAC
Asus Video Card Gtx 660 2gb 192bit Gddr5 Graphics Cards For Nvidia Geforce Gtx660 Used Vga Cards Stronger Than Gtx 750 Ti - Graphics Cards - AliExpress
Best Buy: PNY GeForce GTX 660 Ti 2GB GDDR5 PCI Express 3.0 Graphics Card VCGGTX660TXPB