There are some more modules that you can use together with this e-commerce suite to enrich the functionality:
Flat Rate Taxes: Allows you to apply flat rate taxes to any or all products in the module Products.
warehouse taxes: Calculates taxes for a product based on the US state the warehouse is in, and the US state the customer is situated.
FlatRateShipping: Provides an interface to set up some simple weight shipping rules, and to calculate the cost of shipping based on its total weight.
Destination Based Shipping: Allows the calculation of flat shipping costs based on destination country, and number of items. It does not consider weight in calculations.
PriceBasedShipping: Allows the calculation of shipping costs based on the pre-tax total order price.
Promotions: Allows you to create and manage promotions/sales in the order process. A sale will consist of a start date, end date, a discount or offer, and a set of conditions. Conditions can include...