Audio for Colloquial Czech

Have recently purchased Colloquial Czech, but it didn’t come with audio. I have looked online and I cannot find it for a reasonable price. I don’t feel like paying $50-$60 for a couple cds, when I paid $30 for the book. Does anyone know of a place where I can get it cheaper? I really need to help with my pronunciation of words, as well as to listen to the dialogues. Thanks to anyone who helps me out!