Allows you to integrate your WP shopping cart with your Facebook page
Price: $10
Here’s an easy way to show your products on your Facebook page.  In Facebook, create a tab on the left hand side of your page and customers can view your Jigoshop products right within Facebook!  Customers can also add products to their cart from Facebook, and then proceed to your website to checkout.
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Some Recommended Plugins: Facebook Premium WordPress Plugins

Delivering to top brands – an elegant way to display your products
Price: FREE
You can literally have this thing up and running and taking orders in about 10-15 mins tops.   This great eCommerce solution offer these features: Detailed order and stock reporting via graphs and dashboard widgets, Elegant, lightweight code built upon core WordPress functionality, Create a unique store using built in widgets and shortcodes, One-step-checkout, filterable products, bundles of short codes & widgets and much more!
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Responsive to any browser and device:

Cart66 is a premium eCommerce WP plugin.  The plugin is an easy to use ecommerce plugin with features to sell physical or digital products, offer promotions and coupons, UPS real time shipping rates and more.
Price: $89
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Interested in more? See our full list of Premium WordPress Plugins