Local craft thrift store - yarn for $15/lb, is this a good price?

There's a local craft thrift store near me with TONS of yarn, and I really love it there. I've made 3 or 4 trips this week (gathering supplies to make gifts) and I'm wondering if this is a good price per pound. I guess it largely depends on what type of yarn, it's mostly acrylic with some cotton or wool mixed in (acrylic/wool blends often). It feels like I have spent less than I would've at Michael's though for the large amounts of yarn I've just gotten, lol