Zalman M500WL Wireless Optical Mouse for $1.99 after this $20 rebate. Shipping is $3.58 for a total of $5.57 shipped. Here is a screenshot for your reference. It features Avago 3000 sensor, adjustable DPI button that switchs among 1000, 1500, 3000DPI along with beep sounds, high grip scroll wheel, and more. Most places have it for about $16.