Etekcity via Amazon offers Prime members the Etekcity Scroll X1 2400 DPI Wired USB Optical Gaming Mouse, model no. M555, for $16.98. Coupon code "M5555OFF" cuts it to $11.98. With free shipping, that's $13 off list price and the lowest total price we could find. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise shipping adds $8.64.) It features 125-1000Hz adjustable polling rate, gold-plated copper braided wire, and anti-skid rubber coating.