Mike, my favorites have already been mentioned: roughly in order of preference they're Tower, Amazon and CD Universe. I've found that the Amazon sellers(private or otherwise)often have an item that I want which Amazon itself doesn't, and I've never had any significant problem with them in a couple dozen transactions. Searching enough(including putting the disc title into Google, of course)can turn up almost everything, either here, or in the UK, Japan, etc.

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Enjoy the music, not the equipment.