Sean L. offered up this advice on buying the Joe Hisaishi soundtrack CDs for the Studio Ghibli movies, and I wanted to share it here above ground:
"I'm also a big fan of Joe Hisaishi, and his Ponyo score is one of my favorite works of music ever. It is truly stunning. I hope it gets submitted to the Academy Awards. I've been wondering like you why there isn't a domestic release of the soundtrack. Who knows? Maybe we should try to contact the folks at Disney and urge them to release it.
"Well anyway, I bought the soundtrack CD at a Japanese bookstore here in New York for about $40. That's quite expensive for a CD obviously, but it was worth it anyways. However, I still felt stupid afterwards because I found that you can buy it on Ebay for WAY cheaper. So that's my strong recommendation to you when looking for any Hisaishi soundtrack if you don't have a local Japanese store. Go to ebay.com, search for "Ponyo" under the "music" category, and I promise you'll find a price to your liking. Right now I'm seeing some there for as low as about $9 or $15."