GranVela via Amazon offers its GranVela LED Optical Programmable Gaming Mouse in Black, White, or Yellow for $29.99. Coupon code "BQ7NTMD4" cuts that to $20.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, it costs an extra $8.82.) That's $33 off and the lowest total price we could find. It features a 3,000-dpi sensitivity, LED indicator, ergonomic design, and seven programmable buttons.