If anyone one is looking for a great free ecommerce shopping cart program then try Zen Cart.  Many web hosting companies already offer this program for quick install I have it running a few different hosting accounts and it was simple to set up. The price of the software is zero, but you are getting a professional package, I have paid for shopping cart programs and services in the past and nothing came close to Zen Cart. You can offer promo codes place items on sales and it work well with paypal. Since you can use paypal you do not need to set up a merchant account to get started. The first shop I set up was up and running in about 2 hours. Once you figure out the shipping costs and set up the payment getway you are ready to go live and take orders. You also get marketing support, people can sign up for news letters and the side bars display current promotions. There are also many free themes that you can install to get the right look for your store. If you are not a computer person then their might be a longer learning curve, but there is a great user community out there that can answer most questions. Overall I give Zen Cart a 10 out of 10.