Etekcity via Amazon offers its Etekcity Scroll 6E 4,000-DPI Gaming Mouse for $19.99. Coupon code "6EGM6OFF" cuts it to $13.99. Plus, Prime members bag free shipping. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $8.64.) That's $41 off list price and the lowest total price we could find. It features six programmable buttons, Omron micro switches, and five sensitivity levels.