So, a great place to get perfectly good wool yarn, for much less is your local thrift store. It takes a little searching, and one has be open minded when it comes to colors. But it can got for much, MUCH less!
And sometimes for free! :) I've been pulling apart a much used, but now unwanted sweater and have plans of repurposing it into a sontag.
FIY: One important thing to look out for when checking over a sweater for use, is that the seams have not been cut and serged together!