Home depot has some nice in wall 12 gauge available. I used it for my basement reno project and it worked out quite well. I believe it was about $.90 per metre.

2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83