Newegg offers the Sapphire Radeon HD 6970 Dual-X 2GB 256-bit GDDR5 PCI-Express 2.0 x16 Video Card, model no. 100311-4L, for $89.99. Redeem this $10 mail-in-rebate to cut it to $79.99. With $3.99 for shipping, that's $40 off and the lowest total price we could find. It features an 880MHz core clock, 5500MHz memory clock, DirectX 11 support, and HDMI, DisplayPort, and DVI outputs.
Note: If you haven't yet, use coupon code "MBLMASTER15" and pay via MasterPass using Newegg's mobile site or app to cut it further to $64.99.