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[Nirvana]

Maybe try ThemeForest? A lot of the templates there have a live preview which you can show to clients without disclosing the price at all.

 

[malef!c]

How about hiring someone to design a few for you - benefit of being yours only and no one else selling them.

Places like Sitepoint or Webhostingtalk normally have templates for sale or at least people offering to make them.