You can order them for about US$3 per unit, or $2.85 if you order 10 from BangGood.[1] You can get them for even cheaper directly from Chinese distributors. B

You can order them for about US$3 per unit, or $2.85 if you order 10 from BangGood.[1] You can get them for even cheaper directly from Chinese distributors. Banggood, DealExtreme and AlieExpress are convenient and ship worldwide, but they are not the cheapest, although they are usually already quite cheap compared to most. [1]:http://www.banggood.com/ESP8266-ESP-12E-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-980984.html http://www.banggood.com/ESP8266-ESP-12E-Remote-Serial-Port-W...