INSERT 2 CENTS:
If you buy it at Home Depot or Lowes (bulk) I think it would be affordable. It wouldn't be the multi strand like you would use on a power amp, but signal noise isn't a issue
I didn't think about that, Romex feeder would be great! Easy to bend and put in place. 10gage is about buck a foot, so figure 2 bucks or so for triple wire 8 or 6?