High-Resolution Trade Show Banner

I need an 8' × 30' banner produced at hi rez because it will hang inside our trade-show booth where visitors stand less than three feet from it. The rough concept I have now is only low-resolution; every... (Budget: $250 - $750 USD, Jobs: Adobe Illustrator, Adobe Photoshop, Banner Design, Branding, Graphic Design, Illustrator, Photoshop, Print Design)