I got a men's L Land's End sweater from Salvation Army for this purpose. I've already unraveled one sleeve, but this reminds me that I need to do the rest. It's kind of a pain finding the seams, and mine has hand tied knots in it! Plus it sheds a bunch of fuzz as I'm ripping it out. If I do it all, it will be a lot of yarn, indeed, for $3.