ThemeJam produces blog, magazine/news, business and portfolio themes for WordPress. All of their themes are coded with search engine optimization in mind to help you rank better. Their license lets you use a purchased theme on as many websites as you want. They have a support forum for assisting customers.
Premium WordPress theme sellers typically include support and upgrades with theme purchases. Visit ThemeJam's website for complete details including the most up-to-date pricing.
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