I hear Amazon fulfillment costs 22-30% in most cases. After considering labels, shipping/stamp/packaging/personal time/customer service, and integration costs, is this a value/savings in the end? Or, is it simply just taking some of the burden off of the seller? Just swapping? And, how much inventory and sales would you consider when deciding the point at which to make the move to a fulfillment center? If you are going to hire someone to do this, even part-time, those costs, along with the rest of shipping costs could approach professional fulfillment costs. What is your experience?