70mm fans are very rare. Finding a quiet one won't be easy either....
Try here: http://www.directron.com/70mmfans.html
but you'll most likely need to hook them up on a fan controller such as the Zalman FanMate...but seeing how it's a laptop cooler, I don't know how well that would work out.
And how thick are the 70mm fans you're looking for?
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