AQ makes several options that look very good.
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Elescher,...that looks interesting though the link above did not work until I tweaked it a bit;
It looks in-wall rated at seems to be 10-gauge. Let us know how it works for you as it could be a nice, more cost effective alternative to Romex.
The link to the soundstring cable looks like 3 conductor, which seems like a waste. There 2 conductor bulk cable is
Belden 12 gauge CL3 in-wall is a standard, non-exotic cable. Parts Express and Blue Jeans have it and you should be able to find it locally at an electric supply house. 10 gauge also available.