Etekcity via Amazon offers the Etekcity Scroll Alpha 8200 DPI Wired USB Laser Gaming Mouse, model no. 025706341608, for $28.99. Coupon code "M811GM9O" cuts it to $19.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to bag free shipping; otherwise, shipping adds $8.64.) That's $50 off list and the lowest total price we could find. It features eight programmable buttons, an adjustable DPI up to 8,200, 1,000Hz polling rate, braided fiber cable, gold-plated USB connector, and ergonomic and symmetrical design.