As one of its daily deals, Amazon offers Prime members the Kensington Mouse-in-a-Box Optical Mouse, model no. K72356US, for $5.49 with free shipping. (Non-members can spend $35 or more to dodge the $8.15 shipping fee.) That's the lowest total price we could find by $4. This ambidextrous USB mouse features three buttons and a scroll wheel. Deal ends today.