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I was in a gambling mood and decided to try out the Ebay cables I mentioned earlier and see what they're like. I'm writing up a quick summary here, and including photos of them as I received them.
The quality actually looks very good. The company claims to be a domestic, family owned company, and it definitely appears that these are not some goofy Chinese wonder cables. There appears to be good quality heavy heat shrink tubing on the connectors. The entire length of all cabling is covered in split loom. The terminals had good quality boots. They didn't appear to cheap out on anything. I guess the only possible criticism I might have is to have copper connectors instead of what appear to be zinc plated (?). Honestly I'm not concerned about that though.
I hope the photos I've included are high quality enough to show small detail. Note that even the short ground cable has split loom.
This company is custombatterycables.com. I only happened to stumble onto them on Ebay, but from what I've seen so far I wouldn't hesitate to order from them again. Their quality definitely is better than most I've seen.