Add RGB-123 product page to README

README.md

@@ -4,7 +4,11 @@ Fadecandy is a project that makes LED art easier, tastier, and more creative. We
 
 * [Video Introduction](https://vimeo.com/79935649)
 * [Tutorial: LED Art with Fadecandy](http://learn.adafruit.com/led-art-with-fadecandy)
-* [Buy the Fadecandy Controller at Adafruit](http://www.adafruit.com/products/1689)
+
+Buy a Fadecandy Controller board:
+
+* [Adafruit](http://www.adafruit.com/products/1689)
+* [RGB-123](http://rgb-123.com/product/fadecandy/)
 
 Simple Example
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