I have encountered this 1 month passed and no book arrived problem for Mental Model. And that is resolved but it took some pain (and time) nevertheless.
I ordered Web Form Design and hope that that is a one-off thing.. Ordered it on May 11, and now still have not arrived....
Not only is your store need to be revamped.. your inability to deliver and *extreme* charging is something you may want to address. I have no problem paying but it needs to be delivered! Period!