Yubi Power YPOR61AB 30W 4-Port USB Rapid Wall Charger Travel Power Adapter for $8.99

Yubi Power YPOR61AB 30W 4-Port USB Rapid Wall Charger Travel Power Adapter for $8.99.  Shipping is free on orders over $35.  If needed, use this Filler Tool to pad the order for free shipping.  Here is a screenshot for your reference.  It has a compact unibody design for use on the go, along with foldable prongs for maximum portability.  Most places have it for about $19.