Jet.com offers the Genius GX-Gaming Gila Mouse, mode no. 31010162101, for $47.99 with free shipping. That's the lowest total price we could find by $2. It features 8,200 DPI, 12 buttons, rubber grip, and RGB backlight system.
Of note, new customers can get $10 off orders of $35 or more via coupon code "TENBUCKSNOW", dropping the price to $37.99.