I lucked out bigtime on this one. My fiancee knew I wanted Crucible's cd and couldn't find one. So, she did some hunting on ebay (of all the places) and found one there. I got it as a birthday present a year ago. Yes, I found out about Crucible from the Thoughts (Spock's Beard) mailing list. They'd played at NEARfest or something. I checked here at Aural Moon and the songs were here. After one listen, I was sure I wanted the cd. So, if they were to print more of the cds, I'd recommend to everyone that they get one for their own. It's a great piece of work.
So, in summary, I'd suggest checking ebay.com, spun.com, half.com or even gemm.com (take your checkbook to gemm) and see what you can find at those sites.