Newegg has the IOGEAR GKM581R Wireless Mini On-Lap Keyboard with Optical Trackball for $55 - 20% off with coupon code EMCKEJK92
[Exp 5/16] + $3 shipping = $47 shipped
. Features built in optical trackball, 13 multimedia hotkeys, ergonomic contoured back, and 2.4GHz wireless technology. Mac Mall
also has it for the same price.