Got Joomla, Drupal or Wordpress? Then you must know about: RocketTheme Joomla Templates. RocketTheme is one of the best template sites I know of. The templates have been easy to install and easy to use.
WARNING: This is not a free site! Yes, there are some costs involved, but if you need to put something together with a quick turn around modifying one of their templates works out well. Check it out! The demo I linked to was for Joomla, but I know all of you are smart enough to find the others if you need to. :)