I have a few of these (http://www.wemos.cc/Products/) - their shop link just takes you direct to Aliexpress. They are a very small size and have some cool little shields which makes life easy for prototyping. And also got a few of these (http://www.electrodragon.com/product/wifi-iot-relay-board-based-esp8266/) which are pretty impressive for the price - case included!
I have Homie running on both and they seem very reliable/solid so far (early days admittedly).
Thanks for the links, I was just about to ask the same question.