Has anyone else noticed that shipping on a Sunday, AMZ rates tend to be much higher? I've noticed that when I buy shipping for a customer that lives in the opposite coast ( me living in the west coast) and shipping to the east, AMZ increases the rates of shipping? Usually giving one of the two shipping options: "AMZ Shipping" or "USPS Priority." I don't ship using AMZ Shipping because I rather drop off my packages at my local post office. If i do decide to wait and BUY SHIPPING on Monday, rates drop back to standard price based on weight and dimensions of the product. I think its pretty slimy of AMZ to try to increase their shipping cost when buying shipping on Sundays. I only now noticed and figure I'd let other sellers know as we are all in here wanting to maximize our profits. Please feel free to chime in and give your input.