Good question I honestly havn't done much research myself on them yet, but I'm planning on redoing mine in my 89 Olds and any resourses would be cool. I do hear they are relatively expensive for just being a seemingly "peice of fabric."
go to jo ann fabric's if you got one by you that's where i got all of my suade to do my interior pieces relitevley cheap to was only $12 for like 12ft of it.