Newegg offers the Orico 4-Port USB Car Charger in Black, model no. MPU-4S-BK, for $9.99. Redeem this $5 mail-in rebate to cut the price to $4.99. With free shipping, that's the lowest total price we could find by $13. It includes four 5-volt/2.4-amp ports for most USB-driven mobile devices. Rebate expires February 17.