BuyDig via eBay offers the Memorex Ultra Portable Travel Speaker for iPhone / iPod, model no. MA3122, for $19.99 with free shipping. That's the lowest total price we could find by $23. It supports nearly all dockable iPod and iPhone models via Apple's 30-pin connector. It features a line-in jack, foldable design, and can run on 4 AAA batteries or AC power. Deal ends August 7 at 10:59 am ET. Update: The price has increased slightly to $20.19 with free shipping.