That is pretty cool but yeah, I would think they'd be pricey.
Either way, I move pretty quickly. I ordered from these guys a bit ago:
Truck Toppers, Caps and Campershells for Ford, Chevy, Nissan, Toyota, GMC, Mazda and Dodge Trucks
A friend of mine has one on his Dodge pickup and its pretty good quality. I liked the fact that its easy to install and remove.