mwave offers the IOGEAR Multimedia Wireless Keyboard, model no. GKM561R, for $29.99. Coupon code "2AA93005" cuts it to $27.99. With free shipping, that's the lowest total price we've seen without rebate hassles and the lowest total price we could find by $6. This 2.4GHz keyboard features a laser trackball, scroll wheel, 19 multimedia hotkeys, on/off switch for battery conservation, and more. It requires two AA batteries (included). Coupon expires July 31.

Note that while this keyboard is Mac compatible, the multimedia hot keys are not supported.