unplug your wife/Gf/BF whatever's favorite lamp. take wire cutters. cut.
you now have speaker wire
seriously, ken fisher liked lampcord. just go to any store that sells extension cords or similar and cut off the ends and strip them and there you have it.
if you need to hard wire the speakers in the box itself, any wire will do
my 4x12 basketweave just has standard old connector wire stock