A drag & drop building portfolio theme
Price: $35
Slide One allows you to set custom options individually for each page: Logo, Background, Menu & Social Icon Colors.  Via the theme’s drag & drop “Page Builder” tool, you can manage your page items.  With the theme admin options panel you can create unlimited sidebars, choose from over 350 fonts (or upload your own), 6 footer layouts, 15 predefined backgrounds, 3 image sliders, thumbnail options and more.
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More themes: One Page WordPress Themes

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

A responsive eCommerce theme design to sell 1 special product
Price: $60
Kiosk is a one-page eCommerce design for webmasters or businesses that only have 1 special product to sell.  You could be an author, musician, artist, affiliate marketer, or a small business owner to use this no fuss theme.  This theme comes in a responsive design, uses a featured image slider, 2 distinct color schemes (light & dark), comes with great eCommerce bells & whistles: sales statistics / monitors activity, takes care of shipping & tax, uses the popular WooCommerce to handle payment gateways, and much more.
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More responsive themes: Responsive WordPress Themes

A responsive eCommerce theme for large amounts of products
Price: $39 (Buy1Get1Free or get all themes for $69)
There is a 30% off coupon code available till May 31, 2012 (Coupon code: shopo)

Shopo is a new eCommerce theme built to handle many products seen in large shops / online stores.  There is duel navigation in the header, a nice custom welcome message, featured & product slider.  Unlike most traditional shopping cart experiences, customers will be able to add or remove items from the cart without being redirected to a “shopping cart” page.  Nice huh?  Since this theme is responsive, it works on desktop / laptops and even mobile devices, including your iPad, Android, Blackberry type devices.
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More responsive themes: Responsive WordPress Themes

Sleek price comparison site that works with Amazon and Commission Junction
Price: $65
Stream deals from Amazon and Commission Junction in this price comparison theme that is equipped with built-in support to showcase products easily.  There are plenty of design options that include options to change many parts of a theme, including fonts, backgrounds, and links.  The homepage is completely widgetized, a dedicated blog section, shortcodes (comes with 30), 8 built-in page templates, built-in ad monetization and more.
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More themes: Premium WordPress Themes

A responsive magazine theme with portfolio section
Price: $59
WP Prosper now comes in a responsive design, featured pages / photos / videos sliders, an alternate home page and multiple post & page layout templates, additional page templates for the following: YouTube videos, portfolio, & authors, and many types of widgets for: a featured page, YouTube Videos, Category Posts, Social Networking Icons, & Footer widgets.
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More responsive themes: Responsive WordPress Themes

A simple portfolio theme
Price: $25
Stacker is a simple portfolio theme with 3 Page templates, theme options panel, post formats for blog and portfolio and more.
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More business themes: Portfolio WordPress Themes