If you’re just starting out or looking to sell a few products online a great way to get started until you reach a consistent volume is to use a low cost shopping cart solution.
E-Junkie is a great way for you to get started! I’ve had my eye on e-junkie for several years and have not heard any serious complaints about them. I’ve bought many products from merchants that use their system and have never had issues with security or delivery.
What’s unique about them is that you pay according to the file storage that you use, so if you have just a few pdfs that total less than 50MB you’d only pay $5/month! If you haven’t found a logical reason to use one of their more high priced competitors (like 1 Shopping Cart) I urge you to give them a try. They can even manage your affiliates too!