IOGear 2.4GHz Multimedia Keyboard with Laser Trackball GKM561R for $31.99 shipped with MClub membership and a $6 rebate. MClub is basically a free subscription to Mwave’s discount and emailing list. Here is a screenshot for your reference. This wireless 2.4GHz keyboard features built-in laser trackball, mouse buttons with built-in scroll wheel, 19 hotkeys for multimedia functions, slip Resistant design, and more. Most places have this wireless keyboard & trackball combo for about $48 or more.
Originally posted earlier, this post has been revised and is just a friendly reminder.