You can get high pressure efi hose from edgeworth auto parts for $10/meter but it's red. Thats the cheapest I've found.
I'm nearly certain the fuel lines in my KE20 are aluminium. I bought some steel pipe to make new ones and found it was about four times the weight , and smaller ID anyway! Some new cars have plastic (probably some kind of ABS type) fuel lines. The other thing to do is go to a wrecker and get fuel lines from an XF or something big like that, and re-bend it to suit.