Not many places make those, the resorts ask custom steel shops to make them for them, and they usually run a pretty hefty cost (anywhere from, I'd guess at $100-300. Even the materials are expensive, why do you think wood's the mainstay of backyard jibbing?). So unless you have some spare steel lying around and can weld, or have enough cash to dole out for materials or to a custom steel shop, you're shit outta luck.
..And so it was that when God created snow, Man was compelled to ride through it on two wooden boards..
I ski the flattest place possible....Manitoba, Canada.
Come to Myspace I'll Google your Yahoo, and then get Twitter all over your Facebook.