I am looking to buy the above in about 2000+ x 500 mm. Preferably 2 colors. These things are very expensive. Any idea of where to get the best deal?

What is the catches to watch out for? What should one look for in the spec's? It must be 100% outdoor. I want to use it as an advertising board to catch the traffic's attention. So movement, light, size, double line is important. Must be able to scroll or flash a direction arrow as well.