where to find dmx sheild

does anyone know where to buy a dmx shield I can't find any.

i am planning of building one pretty soon,
give me a month or two and i will have a product to sell.
Patgadget
Montreal

Buy
http://tinkerit.myshopify.com/collections/lighting-solutions/products/dmx-shield
make
http://www.arduino.cc/playground/DMX/DMXShield

or there is always Google