San Francisco :
1. Smith Cart
Smith Cart made it to the top of our list due to its overall power and great functionality. It comes loaded with tons of modules and features to decide what suits your needs best as well as the option to create your own custom check out fields. It is ideal for B2C and B2B Ecommerce websites and is very user friendly with easy to configure back-end settings.
Catalook was designed for the developer so in return it has fully customizable features and canned be skinned to keep in theme with the rest of your website. Catalook is broken down into different modules so you can decide what works best for your website. It also has a feature that places a mini-cart module on every web page that shows the customers current items in cart and total of current order. Catalook also features rentable options for booking things like hotels, cars, etc. While Catalook is at a slightly higher price tag and is packed full of features for just about anything you can think of, it falls into second place due to its lack of SEO tools and is much more difficult during the initial set up. However, the rewards can be great once setup and established.
DNNSpot is the recommended choice for smaller ecommerce stores that do not have a large product catalog; although it has no product or category limit, it becomes difficult to organize and keep track of items with a large catalog. It was designed more the business person/side rather than the developer so it has very easy installation and is easy to use and understand.
4. Portal Store
At a slightly higher price tag than the rest of the shopping cart modules, Portal Store offer tons of features and skin layouts built in and pays keen attention to detail to make sure you get the most out of your shopping cart.
NB_Store is a free DNN shopping cart module that is great if you are looking for a cheap option for a shopping cart. It has many of the important features you want in a shopping cart but lacks the detailed features and customization of some of the bigger players, but hey, it's free.