Sunvalleytek via Amazon offers Prime members the RAVPower 24-watt 2-Port USB Aluminum Alloy Car Charger in Black for $5.99 with free shipping. (It's available in Red or Gold for the same price via coupon code "KINJA801".) That's the lowest price we could find by $7. It features iSmart 2.0 smart charging technology, dual 2.4-amp USB ports, multiple built-in protection methods, and an aluminum alloy body. Deal ends September 30.