Best Buy offers the Logitech G502 Proteus Core Tunable Gaming Mouse, model no. 910-004074, bundled with a $50 Steam Wallet Gift Card for $79.99 with free shipping. (The gift cart will be added to cart automatically.) Assuming you'll use the gift card, that's the lowest total price we could find by $42. (It also beats yesterday's mention of the mouse bundled with a mouse pad and a $25 store gift card for the same price.) The mouse features five DPI settings, adjustable weight, center of balance and placement of weights, and 11 programmable buttons.