Depends on what year of Airstream you have. Best bet, visit a dealer and get a look at current construction or go to a rally or meet a nearby Airstreamer who'll be glad to show you her/his curtains. There are several people who make curtains, but you'll save a lot of money if you can do it yourself.

I noticed your comments regarding sewing curtains. I'm doing great at making the actual curtains but since i have no existing curtains I don't know how to attach the elastic properly. And maybe make the curtain properly for the elastic. Any suggestions?