Etekcity via Amazon offers its Etekcity USB Wired Optical Mouse for $16.96. Coupon code "THEMOUSE" cuts it to $11.96. Plus, Prime members net free shipping. (Non-Prime members can spend $35 or more to bag free shipping; otherwise shipping adds $8.64). That's a savings of $5 and the lowest total price we could find. It features adjustable 1000/1500/2000/3000 DPI resolution, seven functions, and an ergonomic design.