I have built some floodlights that use 10 of the 5050 RGB modules in a work light housing.
Right after I built mine David at HolidayCoro came out with a kit to do the same thing.
Yesterday I saw on his website that he has the kit on sale for $19.95. All you need to add is power and a work light housing that you can get at Home Depot. You can get one fro0m him, but that will kick up the price of shipping.
That is a pretty darn good price.
Here is the link: http://www.holidaycoro.com/product-p/163.htm
David also has very good instructions for building it. Plus he has some good, basic information on using DMX and RGB on his site.
I have done business with David several times and had good service in the past.