Best Buy offers the Logitech F310 USB Gamepad for Windows, model no. 940-000110, for $7.99 with free shipping. (Amazon charges the same with free shipping for Prime members.) That's the best price we could find by $10 and the lowest price we've seen. It features 10 programmable buttons, an 8-way D-pad, programmable left and right triggers, and two programmable mini-joysticks.

Update: It's now available for in-store pickup only.