Scrolls are a great idea, very pretty, and what I originally wanted, but they get expensive to mail. I'd check that out at the post office before going too far.
I don't have a specific website for you, but the cheapest way of getting them would be from India (ironic, I know. so far away, yet so much cheaper). If you google "cheap wedding invitations india" you'll find many sites and you can order samples. They charge for the samples (generally $4-$5), and that would give you a chance to see how the company delivers.
I didn't end up ordering from the companies, but here are a couple examples that I was considering: