I know that I'm not in the US, but I find cd-wow.com (.net for US) the cheapest around, might be worthwhile checking them out.

www.cd-wow.com (UK site)
www.cd-wow.net (US site I think).

Paul.
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Paul Haigh, Reg. 4120 (mk1) 6GB, Blue, 00254 (mk2) 12GB, Red, 00357