WalMart has it and you will find it near the television supplies next to the tv antenna's and stuff.
it will be packaged in 25 ft to 100 ft .
some that i got was labeled by Magnavox in a blister package and is labeled as speaker wire 24 gauge stranded.
also have seen it at Lowe's and home depot in the same section, wherever the tv and radio stuff is located.
A really good substitute to use is the ribbon cable from an old PC. It is very small, easy to use and will last forever. It is used to connect the Hard Drive or Floppy Drive to the Mother Board. Also, you can make a bunch of connections with it if you take a knife and cut it long ways into two wires. I have used it on both my Cams and it works really good. I had about twenty laying around, but you can pick them up at most Computer places.