not helpful amazon, not helpful at all

As I've mentioned before, I ordered almost all of my textbooks online which helped me to save a couple hundred dollars. I've already received most of the books that I've ordered, but the 2 books I ordered from Amazon have yet to ship. I ordered them last Tuesday, and at the time I didn't think that it was necessary to pay for 2 day shipping (I instead opted to go for cheapish 5-9 day shipping). It would have been completely sufficient if they had shipped sometime last week. As is, my estimated receipt date was scheduled on the 12th, but this afternoon I figured that if they hadn't shipped yet, there was no way they would get to me by the 12th with standard ground shipping (especially considering they usually ship from some place like Hoboken, and I am in the middleish part of the country). So I upgraded to the 2 day shipping, which cost me an extra $13. I was kind of annoyed at having to pay more for shipping, but the books are still cheaper than in the bookstore and I guess gas is hella expensive these days, so I wasn't too burned by it. Until I got my new estimated receipt date: August 15th. Frick! Frick frack friggidy frick!! What the hell Amazon? This is the exact opposite of what I want. Thirteen more dollars should not = later shipping. It should = get your shit together and send them tomorrow. This is what I get for trying to be financially responsible and save a little cash. Not happy.