ESP8266 Community Forum

$4.70
http://world.taobao.com/item/5207908716 ... 0.0.oW83Oi

Product Introduction
· Support 802.11b / n / g wireless standards;
· developed MCU platform, high cost;
· Support UART / GPIO data communication interface;
· Support STA / AP / STA + AP mode of coexistence;
· Support SmartLink intelligent networking capabilities (provided APP );
· support wireless upgrade firmware;
· Support WPS networking configuration;
* Built-board antenna;
· temperature and humidity sensor;
· RGB three-color light adjustable;
· provide a rich AT command set configuration;
· Free AiCloud cloud services for debugging;
· 3 section 5 batteries / 5V adapter power supply;
* Size: 61.6 mm x 56.2mm ;

I can't create an account, can't read Chinese to get pass the captcha test and I don't think they take PayPal!

You might want to take a look at this review first.

https://esp8266hints.wordpress.com/2015 ... ignore-it/

Undocumented 8051! I'm working on a design that required expanding I/O but the 74HT259 addressable latch device I wanted to use is not cheap. I found a sweet 48 MHz Cortex-M0 in a 24 pin package for $0.24 more then the 74HT256. I checked some 8-bit devices and they were all running ~$1.20 (tinyAVR and TI) where as the ARM device is $0.90 with 8K flash.