I had DH Labs cable and yes you can get a used set off of Ebay for 100 bucks. I sold them. Presently I'm using Knukonceptz silver plated 10 gauge cable. The insulation is Polyethylene which has a dielectric very close to teflon like the DH Labs. This stuff is 2 bucks a foot on Ebay or 1.50 a foot for the 12 gauge. My spades cost me twenty bucks so I'm into my cables for about 60 bucks and they should last alot of years as the silver won't be a problem and the polyethylene insulation won't rot and oxidize the copper. This is my system:
Audio Research LS 16, Parasound HCA 3500, Sony Dvdnc 555 ES and a modded Kenwood Kt 7500 tuner going to VMPS Supertower/R SE speakers. My point is this is 5 figures worth of gear, I've been in the hobby for over 30 years and I can't hear a difference AT ALL. My room btw is a dedicated room, full LEDE with bass traps and a quality equalizer. I assure you, a bass trap or room treatment is a much better place to put the money.
And yes I am fortunate in that I have a friend who is an EE no less that loaned me several sets of very expensive cable, I spent a couple of weeks trying to hear something, nothing, nada. I actually think DH labs cable bought used isn't a bad buy but no way I'd buy new. Get some used off Audiogon, wire goes for half or less than retail when used. Cheers