Sunvalleytek via Amazon offers the RAVPower 24-watt 2-Port USB Car Charger with iSmart in Black or Red from $7.99. Coupon code "DEAL0905" cuts the price to $5.99. Plus, Prime members qualify for free shipping. That's the lowest price we could find by $3. This thumb-sized charger features iSmart 2.0 smart charging technology, dual 2.4-amp USB ports, multiple built-in protection methods, and an aircraft-grade aluminum alloy body. Deal ends September 22.