For one, shipping is going to cost you more than the awning, and two, they would come in sections, not a complete 20 feet item. Suggest heading to your local hardware store or check the local yellow pages for vendors that deal with this type of stuff. Usually awnings of that size are made out of canvas, and better ones are retractable, so that when you do not need them, they are rolled up and stored.
__________________ Ren: Now listen, Cadet. I've got a job for you. See this button? Ren: Don't touch it! It's the History Eraser button, you fool! Stimpy: So what'll happen? Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?