Scott, if by "no luck", you mean that you didn't find in-wall rated 14 or 12ga at HD or Lowes, that's surprising. If so and you want to order on-line(with shipping charges, of course), Blue Jeans has Belden 5000UE for $0.38/ft. and Parts Express has Carol's 14/2 at $27.86/100 ft. Both are CL3R.

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Enjoy the music, not the equipment.