As one of its daily deals, 13 Deals offers the Merkury Innovations Portable Vibration Speaker System in White or Green, model no. M-VSP100, for free plus $5.49 for shipping. That's the lowest total price we could find by $8. This portable speaker turns any object into a speaker using sound vibrations. It's compatible with any music device that uses a 3.5mm jack and requires a USB power cable or two AAA batteries (not included). Deal ends August 4.
Note that the speaker color will be chosen at random for you.