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There are plenty of them.

Selle Italia Flite Gel Flow, Selle Italia SLR Gel Flow etc etc. Almost all models of Selle Italia saddles have a cut out version. Selle SMP saddles are popular too. Terry FLX has a cut out and many many many many many more.

http://www.pricepoint.com/detail/211...ails-Black.htm

There's a good one. I have the non-cut out version which fits my behind very perfectly.