1991 Chevy Truck Fuel line

I am having difficulty finding the actual replacement part outside of a dealership. The $270.00 quote they gave me for the sending and return lines is way outside what I expected to pay. I have gone to several online retailers but I can't find one that carries it.
I would rather use a new part than slap together a repair, but I am being left with little choice. Would you know of anywhere else I can look for a new part?

The line that's leaking goes from the TBI carburator to the first fitting and travels along side of the bell housing ending at the fuel filter along the frame. I'm not sure if it's the sending or return line but they're both so rusty I want to replace/repair both. And, because they are so rusty, I didn't want to handle it very much because I want to keep it together until it comes time to fix it just in case I need to drive it.

I read something on your site saying that TBI is only running at 15 - 17psi. Shouldn't a rubber gas line hold this?

Worthy of note: both lines have a curious section of rubber half way down. It's crimped to the steel from the factory. I can only guess that this is in case of a head on collision the gas line will be able to flex to the pressure. If I'm right, then using all steel gas line will be just as dangerous.

Little history: 3 months ago I replaced the gas tank, sending unit, filler neck and all lines up to fuel filter. I couldn't find any more parts so I left it at that. Now I have no choice but finish what I started.

I appreciate your help so far in this matter.

Looks like there's no cheap way to do this. I'm just going to have to bite the bullet and pay the 270 just to stay on the safe side. I guess that's really not that much to pay for peace of mind.

Thanks for being the voice of reason.