Amazon offers its Prime members the Logitech M510 Cordless Optical Mouse, model no. 910-001822, for $19.99 with free shipping. (Non-members can spend over $25 for free shipping; otherwise, shipping adds $8.28.) That's the lowest total price we could find by $12, although it was $2 less in January. This wireless mouse features a nano-receiver, ergonomic design, and more. Two AA batteries are included.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.