iXCC via Amazon offers Prime members the iXCC Universal Dual USB Wall Charger in White (pictured) or Black for $6.99 with free shipping. (Non-members can spend $25 or more to get free shipping; otherwise it adds $8.09.) That's $3 under the lowest total price we could find for such a wall charger. It can charge two USB devices simultaneously.
Stocking up? Add two to your cart and apply coupon code "3FRMXLQG" for a final price of $12.98 with free shipping via Prime.
Shipping: Free Shipping