Amazon’s e-retail market share seems to grow every year.  It doesn’t require a Harvard education to know that if you don’t have a presence in this marketplace, you’re missing out on a huge amount of new customers.  You need to sell here, but with any new business venture, there will be new expenses.  You might be thinking “how much does it cost to sell on Amazon?” so here’s a quick rundown on the different types of Amazon seller fees and when they are charged.