$20 is alot cheaper than the $50 for the official shield.
http://hackanerd.wordpress.com/2013/07/06/how-to-make-a-simple-arduino-wireless-shield/
$20 is alot cheaper than the $50 for the official shield.
http://hackanerd.wordpress.com/2013/07/06/how-to-make-a-simple-arduino-wireless-shield/