Sunvalley Brands via Amazon offers the RAVPower 24-watt Dual-USB Metal Car Charger in Black for $7.99. Coupon code "VC006RAV" cuts it to $5. Plus, Prime members bag free shipping. That's tied with our January mention and the lowest price we could find by $4. It features two 2.4-amp iSmart USB charging ports. Deal ends March 28.