Arthur, you've named some of the major U.S. sites for classical CDs(hbdirect is another one). I'm wondering if you're looking for some specific compositions or performances or just looking to try a few SACDs to see if there's any difference. Arkiv, for example, has 575 classical SACDs listed and there might be some of interest to you. I'm not personally aware that there're all that many more available in Japan.

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Enjoy the music, not the equipment.