The Theme Foundry has a growing collection of premium WordPress themes. They offer free versions of each theme so you can sample their quality on your own install of WordPess (the free themes have stripped down features). All of their themes are GPL licensed and can be used on multiple sites. You get lifetime updates for each theme you buy. Existing customers get 25% off future theme purchases. The Theme Foundry provides support via a forum plus tutorials, videos and documentation.
Premium WordPress theme sellers typically include support and upgrades with theme purchases. Visit The Theme Foundry's website for complete details including the most up-to-date pricing.
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By the way, if you ever need a premium plugin, try Pro Plugin Directory.