DIY battery cable supplier

and if your going to use cable larger than about 10ga (small wire number) look into a good hydraulic crimper, avaiable on ebay at reasonable prices. especially once you get to cable sizes from 4ga down to #0000.
crimp, cover with adhesive lined heat shrink. All of mine I used welding cable I cut to length, again cable cutters avaiable on amazon or ebay. Since welding cable is usually only available in black, I use red or black heat shrink as appropriate.

Thanks for the suggestions people!

I get materials and use their tools at West Marine Supply.

I ordered my new battery bank cables with ring terminal ends from AMAZON...

Roy Ken

Lugs are sized for SAE wire. Buy one gauge larger lugs for AWG cable

Delcity.net

Quickcable.com

+1 for genuinedealz

http://www.genuinedealz.com/custom-cables/custom-battery-cable-assembly

This is the best place for what you need. Parts and custom cables are their specialty plus prices are reasonable.
http://www.genuinedealz.com/about/

Most auto parts stores would have what you need.
Or, welding supply stores.