The corrugated blanks are called corplast. Don't forget to order stakes for each sign.
Any outdoor vinyl can be cut and applied to the blanks. I use Oracal 651.
You will also need application tape, squeegees, a ruler, masking tape etc.
Try
The World's Largest Wrap Supply Company - Fellers for supplies. They have good prices and a all the tools and material you will need.