So eStoreBuilder calls itself an 'affiliate marketing game changer', but what are the facts? What is it, is it any good and should you buy it? eStoreBuilder is internet based software which allows you to build your own health & fitness supplement store, including a shopping cart, with a few clicks of your mouse. You earn commission on all the products sold from your eStore, with payments up to $257 for a single sale. It's membership based with everything accessible online, so you can run your store from any PC with an internet connection.