OrderBorder offers the GreenPlanet SoL Tube Speaker for Apple iPod, iPhone, or iPad in Black (pictured) or Silver for $42 with free shipping. That's the lowest total price we could find by $8, outside of the mention below. It features 2-watts power output per channel and works with most iPhones, iPods (except Shuffle), iPads, and other audio devices. It includes two audio cables, USB power cable, and a wall charger. For portable use, four AAA batteries are required (not included). Deal ends April 13.

A close price: Beach Audio charges $35.85 plus $8 for shipping. Stock is limited, but more colors are available.