1. WP Auctions: This plugin enables you to host auctions on your blog and sell without having to pay the fees. This means you will not have to pay for listing, selling, gallery fees or any other fee that online auctions come up with. It is all now in your control. Awesome!! The way it works is you list your auctions and then register your plugin with the WP Auctions page, this generates traffic for your blog. You can start any number of auctions as well as upload auction item images; you can sell “Buy it Now” items as well as items for bid. The plugin also enables you to show third party ads in the event there are no auctions going on. There are many other features as well including pay via PayPal, RSS feeds, etc. For more information go to http://www.wpauctions.com.
2. PayPal: Of course no ecommerce site is complete without offering the advantage of paying with PayPal. Why is PayPal so important? Because it keeps all your online purchases in one convenient place. For example, I often buy business-related equipment online using PayPal. At the end of the year when I am gathering my tax information, I simply go to PayPal and run a report for business expenses. Everything is right there and easy to access. So it is very important to have PayPal on your shopping site. There are some PayPal plugins that you may be interested in:
   • PayPal shortcodes which allows you to insert PayPal buttons into your blog posts or blog pages.
   • The Easy Donation plugin gives your visitors the option to make a donation to your cause using PayPal.
   • The ArtPal plugin is also a PayPal feature and is used specifically by artists. This is a great way for artists to sell their work online and helps them to organize and keep track of sales with features such as real-time sales updates so you will never have to worry about selling the same piece of art twice.
3. WP e-Commerce is a shopping cart plugin. Users like it because developers paid careful attention to making it not only easy to use, but very pleasing to the eye. It has a classy, polished look and feel to it. This shopping plugin is considered one of the best, if not the best for WordPress.  This plugin will: update automatically when WordPress updates, install in minutes, provide you with tools for importing your products and/or services into the Google base and Facebook Marketplace, gives your customers multiple payment options and allows you to customize and tweak it so the page will look the way you want it to look. As you can see WP e-Commerce is a plugin that has really gone the extra mile to make e-Commerce easier for you to implement into your WordPress blog.
4. Quick Shop needs to have the Sidebar Widgets installed, but once that is taken care of it really supports any WordPress. Quick Shop will add a SideBar widget to show the shopping cart items. From this side bar the visitor can remove the items, quite a nice feature! Quick Shop is also designed so that adding products to the WordPress blog is easy.
5. eShop: This plugin allows you to store downloadable products, gives you a variety of methods for listing products, provides sales data, can send automatic email confirmation of purchases, has a stock inventory control option and many other features to help you run your shopping business smoothly and efficiently.
6. WP Live-Shopping: This is actually a widget and it allows you to show all your shopping offers on your blog with just this widget. The widget can be added to our side bar and then you can customize it to fit the look and feel of the rest of your blog.
7. YAK Shopping Cart: The YAK shopping cart plugin is fairly basic for shopping and ecommerce purposes, but it does get the job done. With this plugin you have three pages in your management screen, one page for showing orders and fulfilling them, a second page for product management and then the third page is for sales reports.

As you can see there are plenty of options for you to be able to setup a shopping or ecommerce WordPress blog. You should investigate each option to find the solution that best fits your needs.

Related posts:

1. WordPress Plugin to Increase SEO Rankings
2. 5 Image and Gallery Lightbox Solutions for WordPress
3. Using WordPress to Promote Affiliates