iLuv iSP200BLK Stereo Speakers for $19.99 shipped.  It is sold by woot through Amazon.  Here is a screenshot for your reference.  It has integrated stereo audio amplifier, baster and bass controls, as well as built-in USB 2.0 hub with 3 USB ports and a 3.5mm aux input.  Most places have it for about $45 or more.