RocketTheme is a club-based provider of professionally designed WordPress themes. They release one new theme every month and have been doing so since 2009. Their themes feature unique designs and a huge array of innovative features. Many of their themes include a Color Chooser that makes it possible to create a custom color scheme. Their newer themes are based on the powerful Gantry Framework.
They offer several membership options. If you only want one theme, you can sign up for a short-term membership. If you develop sites for clients, you can sign up for the yearly "Developer" membership which includes unlimited use of all themes on as many websites as you would like. Support is provided on RocketTheme's members-only forum.
Premium WordPress theme sellers typically include support and upgrades with theme purchases. Visit RocketTheme's website for complete details including the most up-to-date pricing.
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