I think you are looking for two decals, which you intend to apply on Coroplast. This kind of work is frought with potential problems. You should find a printer who prints directly on the substate. Laying down large vinyl, if you don't do it regurarly, can be a problem. And 1/8" PVC is much better and the cost is in the ballpark.
You should be able to place your order with any vinyl printing service without telling them what you're doing. This service is also available on-line and costs about $3.00 a square foot.
Profit margins are so narrow in this business customer care is dreadful. There's a lesson to be learned.