Sunvalley Brands via Amazon offers the RAVPower 24-watt 2-Port USB Aluminum Alloy Car Charger in several colors for $7.99. Coupon code "DNRVC006" drops it to $4.99. Plus, Prime members bag free shipping. That's tied with our September mention and the lowest price we could find by about $5. 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 October 31.