Some places to find website templates:

• TemplateMonster.com
• DreamTemplate.com
• ThemeForest.net

Places where you can get Wordpress Themes

• StudioPress.com

Joomla Templates

• TemplateMonster's Joomla templates
• Joomlart.com
• JoomlaShack.com
• Gavick.com
• TemplatePlazza.com
• BestOfJoomla.com
• Joomla24.com - free Joomla templates
• JoomlaTP.com - free Joomla templates