Maybe I was just slow to react, but I seem to recall getting an e-mail, and then going to my account only to find the order being processed and unable to be changed.
The other thing is that, even if you are a Prime member, subsequent orders ship ground or USPS. To counter the slow shipping rate they'll bill you and send them a few days earlier so they arrive on the date. If you ask to be sent a refill right away, it'll ship 2nd day for free for Prime members. Not that is really makes a difference, as it will arrive on approximately the same day. But it's the principle.
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs