Fully responsive and professional business theme
Price: $35
Sterling is a theme with many options: 18 Gorgeous Color Variations, 18 Unique Page Templates, 11 Custom Widgets, Unlimited Sidebars, Unlimited Sidebars, Powerful Built-in Contact Form Builder, Premium Stock Images and more.
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More business themes: Best Business WordPress Themes

Responsive theme with a fresh feel
Price: $35
A modern WordPress theme with style customization features to make the theme your own.   Theme features include: 3 unique sliders (Book Slider, Motion Slider or Simple Slider), unlimited color variations (change fonts, font sizes, background images), unlimited sidebars, contact form builder, different page layouts, 3 custom post types, 4 portfolio layouts, and much more.
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Best for freelancers and small business owners
Price: $35
A simple WordPress theme with unlimited color choices, a custom header for single posts and pages, 7 portfolio layouts, footer widgets, theme options, custom widgets ready, and more.
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More children themes: Best Business WordPress Themes

A responsive business theme with lots to look at
Price: $49.99
InBlog is a premium responsive theme that is designed for corporations, businesses or freelancers that would like a modern look with lots of places to showcase content and images.  Features include: 10 special page templates (testimonials, 1, 2, 3 or 4 column portfolio, services, archive, sitemap, landing page), many color and background choices, homepage slider, fully responsive Flexslider, 9 custom widgets, and more.
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See some more great themes: Business WordPress Themes

Clean and modern design with an integrated Page Builder
Price: $35
Good Space comes with an awesome tool to allows you to build pages within WordPress easily.  You may create unlimited sidebars, pick from over 450 fonts, have the choice to pick your own cufon by using a cufon uploader, a theme options panel, 6 Footer Layouts, 4 Blog styles, 15 predefined backgrounds, pricing table, and a drag-and-drop page builder with slider manager.
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More portfolio themes: Best Business WordPress Themes

A powerful responsive theme with custom choices
Price: $35
Natural is a theme that comes with a powerful admin panel to create a corporate website, a portfolio or professional blog in minutes. You will have unlimited home page layouts, custom headers (display an image, full-width slider, or a map), choose from 16 pre-defined color variations, a big collection of 130 pre-made background textures and an uploader to use your own custom background, a built-in like button for post AND portfolio items, unlimited sidebars, 5 sidebars (footer, sidebar, portfolio, gallery and page setups), 3 responsive sliders (choose from FlexSlider, Elastic Image Slideshow, and Responsive Slides).
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More responsive themes: Premium Responsive WordPress Themes

Unique and flexible responsive business theme
Price:
Single Theme Package: $45
InkThemes Membership (All Themes): $125

Regal is a theme that is flexible enough to fit into many types of niches, including: business, portfolio, personal, hotel, or wedding website. Theme features include 8 color scheme options, a gallery template, theme options panel and more.
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More portfolio themes: Business Premium WordPress Themes