Ending today, aSavings via Rakuten Shopping offers the Logitech G502 Proteus Core Tunable Gaming Mouse, model no. 910-004074, for $62.99. Coupon code "G502" cuts that to $54.99. With free shipping, that's the lowest total price we could find by $6, although we saw it for $5 less last winter. It features five DPI settings, adjustable weight, center of balance and placement of weights, and 11 programmable buttons.