1byone Products via Amazon offers Prime members its 1byone 6-Button Gaming Mouse, model no. 509US-0001, for $11.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.35.) That's $7 off list and the lowest total price we could find. It features six programmable buttons (in addition to the left- and right-click buttons), adjustable sensitivity (1000 to 4000 dpi), and LED lighting.