Newegg via eBay offers the Gigabyte GeForce GTX 1080 8GB 256-bit GDDR5X PCI Express 3.0 Video Card, model no. GV-N1080TTOC-8GD, for an in-cart price of $419.99 with free shipping. That's the lowest total price we could find by $70. It features a variable core clock speed of up to 1.7GHz, 10GHz memory clock, support for DirectX 12 and OpenGL 4.5, and HDMI, DVI, and DisplayPort inputs.