Newegg via eBay offers the G.Skill Ripjaws MX780 Wired Gaming Mouse, model no. GM-L8200CL8-MX780D10, for $36.99 with free shipping. That's the lowest price we could find by $13. It features an ambidextrous design, interchangeable side grips, Avago laser sensor, 8200 dpi, and eight programmable buttons.