I need an e-commerce solution that allows shipping rates from DIFFERENT addresses since I drop ship a lot of products from a 3 different suppliers (Southern California, Tempe, AZ, and Sheboygan, WI) to customers throughout US. Does MarketPress allow this? I paid for WPMU thinking MarketPress is the "best designed and most powerful ecommerce / shopping cart plugin available for WordPress today." Many solutions have the drop shipping functionality. Please advise how I can utilize MarketPress to accomplish this. Thanks!