5' filon source

[rockdog57]

Where are you guys sourcing filon? Every site I go to only sells 8'6" rolls by the foot. I'm building an 8' teardrop using Tony's book as a reference. The 8' 6" would work great for the sides. But in order to not have a seam in the roof I would have to order a lot ($$$$) more than I would need if I could get it in a 5' width. I searched the site and couldn't find an answer. I really don't want to go aluminum or fiberglass and paint. Teardrop builders that build commercially have to be sourcing this somewhere?
Thanks