If you can order from Taobao (China) directly, here is the device I bought last week: http://detail.tmall.com/item.htm?spm=a230r.1.14.27.Op5P4y&id=21996816947 h

If you can order from Taobao (China) directly, here is the device I bought last week: http://detail.tmall.com/item.htm?spm=a230r.1.14.27.Op5P4y&id=21996816947 http://detail.tmall.com/item.htm?spm=a230r.1.14.27.Op5P4y&id... (not affiliated, around $0.8 USD). Another added advantage in using the device is it can double the current output from my Macbook Air USB port, i.e. from 500ma to 1000ma, so now I can fully charge my Samsung S4 within 4 hrs (as compared to 7-8 hrs previously).