Shnoop.com via eBay offers the refurbished iHome Portable Stereo Speaker System, model no. IHM10, in six colors for $5.99 with free shipping. That's the lowest total price we could find for a refurb by $7. It runs on four AA batteries (not included) and features a 3.5mm input, rubberized mp3 player/smartphone cradle, and two speakers.
Of note, no warranty information is provided.