You can find some pretty cheap inwall cable at Parts Express , in a few different gauges & conductor counts.

I made my order from www.bluejeanscable.com and had some of the White jacket, 10 AWG two days later.

I did Blue Jeans 10 AWG white too - 50 feet for my back speakers. At 40 cents a foot plus very reasonable shipping I think it's a very nice value for money. The only thing I don't really care for is the faint blue sentence describing the cable printed on it, but you really don't notice from a few feet away and only 8 feet of cable is visible in my home anyway.

Blue Jeans cable has a twist to it that I'm told creates self-shielding, but I can't comment on the science behind that.

For information on choosing gauge for a particular cable length, and other speaker cable points, have a look at:

http://www.roger-russell.com/wire/wire.htm

kjl,

Thanks for the link to the Roger Russell site. His chart that showed which gauge to use based upon length and speaker resistance is very helpful. I appreciated his no-nonsense discussion on speaker cable performance and how speaker cable sales have been largely based on marketing. Other types of cables get the same hype. It irks me when I walk into a retail store and see the flashy packaging and the cables corresponding high price. I think a lot of consumers that don't, or can't, research cable's performance get ripped off. The other day I was in Radio Shack and saw a 6 foot HDMI cable for $120!! I already had one at home from a reputable online company for $16 that works great. What a racket.