Even though WP Auctions was specifically made for hosting auctions on your own blog it can very well be used as an e-commerce plugin.
The auction comes with a “Buy it Now” feature that can be used to sell items in the traditional direct way to your end user.
Configuration is as simple as setting the start price at 0, or leaving it blank and just filling in the Buy it Now price in the field provided.
You can now directly sell anything you like on your blog with this feature. Remember, you can also place it in your post and show it off via the provided sidebar widget.