mwave offers the IOGEAR Multimedia Wireless Keyboard, model no. GKM561R, for $42.99. This $12 mail-in rebate drops it to $30.99. With free shipping, that's the lowest total price we could find by $12, although we saw it for $3 (also after rebate) in February. 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). Rebate expires June 26.

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