I go to a secondhand CD shop around my house, every once in a great while I find a cool CD, and they're only about $7. I found the H.P. Lovecraft I/II CD there- my best find
I also live close to a Barnes and Noble, and that's where I found a CD version of After Bathing at Baxters. Most electronic stores don't sell "obscure" music from the 60s, but Barnes and Noble does a better job then most- if they don't have the CD in stock, they can have it shipped to the store for you, and you don't have to pay for it until you actually see it. The only problem is their CDs tend to cost a couple bucks more then other places.