Amazon has the Logitech V220 Cordless Optical Mouse in a fancy pants "Blue Flourish" paint scheme for $20 - $8 rebate = $12 with free shipping on $25. Features side to side scrolling plus zoom support, and the mini receiver easily snaps into the mouse.
Amazon.com: Logitech V220 Cordless Optical Mouse for Notebooks (Blue Flourish): Electronics
Amazon.com: Logitech V220 Cordless Optical Mouse for Notebooks (Blue Flourish): Electronics