Meritline.com offers the Belkin F8Z145 Dual USB Power Adapter for $19.95. Coupon code "MLC5AMLKQW5NL1" drops it to $17.95. With free shipping, it's the lowest total price we could find by $6, although we saw it for $8 less over a year ago (since expired). This adapter allows you to charge multiple USB devices at the same time. It also includes a USB to iPod / iPhone / iPad connector, and a mini-USB cable.