I bought it locally from a place called Custom Signs & Shirts. The material is made out of the same as a yard sign. I just screwed it to a plywood backer and used Liquid nail.
My wife took the picture and I have been using the same picture for all my signs. I got yard signs made a few months ago and I took two of them and screwed them to both sides of a plastic saw horse. I put the sign out in front my truck so passerbys can see it while I'm working.
I just went to the sign convention in town yesterday and they were running samples off all day.
I got my daughter a 4ft x 8ft picture for her wall of girls playing on the beach. This thing looks better than a 35 mm picture inches from your face. It was amazing. There was one company running and giving away 10ft x 30ft pictures!!
The Led stuff was amazing. My Friend who invited me had a 10x30 booth. The entire back of the booth was LED and had High def movies running on it!
Signs are big business.