I've found good wire on EBay at reasonable prices. EBay sellers often
have wire in smaller rolls. I got some high-quality military surplus
RG-176U coax and only purchased 25 feet. You have to buy a 100-foot
roll from Mouser, etc.. Here's a picture of the coax on my CGS Tube VCA
module:
http://pugix.com/synth/dual-cgs-65-tube-vca-timbral-gate/cgs-tube-vca-back/The cable looks copper in color, because the insulation is clear teflon.
I also found some100-foot rolls of really nice 22 gauge wire with high
temperature insulation in different colors. You do have to know what
you're shopping for, of course.
Richard Brewster