Oh and cheap too…But not as cheap as an RPi Zero. Lately I have been thinking more and more about switching completely over from arduino to just RPis. The price point is pretty close and for what you get from a RPi (full linux OS), makes it worth looking at. However this does includ WiFi with this design.
http://www.instructables.com/id/ESP8266NodeMCU-Weather-Station/?ALLSTEPS