I'm looking at the fuel hoses at:
http://www.chaparral-racing.com/Chaparral/dept.asp?dept_id=3810&Gift=false&GiftID=
MrCycles has similar choices. I had some Helix hose, but I think it was PVC, which I had to replace (I can't use PVC, nor polyurethane for more than a year).
I can use Buna-N, Neoprene, Silicone, Teflon, HDPE/polyethylene, and Viton (in about that order). Neoprene is the easiest to find, but it's thick stuff, and a pain to work with at the tank fitting. I used to see lots of Teflon/Viton on eBay, but not this year.
I'd try the local chain stores first. They usually have an assortment. I would have to read the material listing on the tube.
Industrial supply houses also might help with your quest.
Why can't you use PVC, etc? Allergies/medical reason?
He runs E-85 so I think that is why...