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Shopify is a fairly attractive, intuitive & easy way to quickly build yourself an online store.
They offer several different pricing plans beginning with a free package that allows you sales of ten items before you have to change plans which is a nice way to set up a store and test the waters without having to spend any money.

Some of the nice features of Shopify are:

- Easy to set up, professional, standards compliant templates that are customizable.

- Product & order management that makes it easy to list products, take orders, manage shipping & control inventory.

- Integration with major online payment processing such as PayPal and Google Checkout.

These are just a few of the basics, there is really a wide variety of options. So if you have just a few items to sell or are interested in a full blown e-commerce site with hundreds of pages Shopify might be the solution you are looking for. I built  a page to list some of my items and it was really easy to set-up. I need to optimize with some better images but with just the free plan it only took a little work until I had my own store. You can see it here -> GarnetStreet Books & Prints