Newegg offers the Logitech G502 Proteus Core Tunable Gaming Mouse, model no. 910-004074, bundled with a $20 Newegg Gift Card for $79.99 with free shipping. (The gift card is added automatically to your cart and will be emailed to you four days after purchase.) Assuming you'll use the gift card, that's the lowest total price we could find by $18, although we saw it for $12 less last month, albeit without the gift card. It features five DPI settings, adjustable weight, center of balance and placement of weights, and 11 programmable buttons.