This deal has ended.
Buy.com has this ChargeBlock Car Charger for iPad/iPad2/Xoom for $4.99 with free budget shipping, a $5 drop from last month's best price and the lowest we could find currently by $13. This adapter plugs into the cigarette lighter in your car, allowing you to charge your device by USB port. It comes with a 3 year warranty. Sales tax is only charged in CA, MA, MD, NY, and TN.