WP iSell plugin allows you to create a product display box that you can show on a WordPress post/page to sell digital download.
Top 6 Digital Items to Sell Online
If you are thinking of starting your own business or simply wish to supplement your income, making a profit from selling your knowledge, skills and creations has never been easier. No longer limited by their geographical location, consumers today have access to an unprecedented variety of products and information available at their fingertips, which means that no matter what you can offer to the world, you are likely to find your customer niche online.
WordPress iSell – Easily Sell Digital Downloads From Your WordPress Site
WordPress iSell is an easy to use WordPress plugin to sell digital downloads from your WordPress site (for free). This plugin is designed to do one thing only but do it really well, which is to sell digital downloads from your WordPress site via PayPal.
If you need a more robust method of selling digital downloads via PayPal, check this paypal wordpress plugin.