Here's an article that tells you how to make the barn door "hardware" for 30.00 but I don't think it includes the price of a barn door.
Lots of sites that tell you how to make $30 hardware but not the entire door.
Hi Sonja: Was it a Hometalk door? If so, maybe this is the site you are looking for:
Or, if you're talking about the pull up bar for doors, check here:
If not, let us know and we will continue to try to help.
Never saw barn door hardware that cheap, mostly $55 is cheapest. The door(s) you can build from pallet wood and reclaimed wood thats free.