Where's the best place to get a wiring harness?

[White70C20]

Hello all,

It's been a while since I've been on here. Things have been busy with my summer job. Also, I haven't been able to work on either of my trucks (I'm back home in Iowa and the trucks are in Kansas). I've decided I want to start collecting parts and supplies I need for my grandfather's C20 while I'm home over the summer. I know I need an entire new wiring harness (bumper to bumper). This brings me to my question: Where would you guys suggest I look to get an entire wiring harness?
And as with many things with this truck, I'd like to keep cost to a minimum if possible. So far I've been pretty lucky in finding parts fairly cheap for this truck, but I know the electrical side of it is going to be fairly pricey.

Thanks!