FYI, I found some great battery cables on the McMaster Carr website. I bought ten feet each of 1/0 awg 1016 strand super flexible battery cable in red and black. This stuff is way better than any welding cable I have seen, and was only $2.74 a foot. This compares to $3.75 a foot at the MAD Electrical site. McMaster Carr has just about anything you need and will get it to you fast.
Disclaimer: I have no affiliation with McMaster Carr. Since I have started building my street rod I have found them invaluable for a lot of things, especially stainless fasteners.