I saw this a week or so ago and thought it looked pretty good, given the trend toward no external storage slots on phones like Xperia Z and HTC One. So I put up my USD12 (which includes international postage) and will use it with my new S4 or HTC One - once I decide which one to buy. It will take cards up to 64GB.
http://www.kickstarter.com/projects/andyfei/mini-microsd-reader-for-android-smartphones-and-ta?ref=live