I'm getting ready to run a second battery so I can run a 3rd amp but I really don't want drop $300-400 on wire to do it. I figure I'm gonna need 26ft total to get the back (running pos to pos and neg to neg from the main battery). I really don't care about color since only a small bit will be visible and I can heat shrink that whatever color I need. So where can I get the best bang for my buck on copper?