Okay, I am also waiting for the iMac 27" to be shipped to me

i hope this okay I bring this here, I didn't see a reason to start a new thread.
anyways, i ordered this beast on November 4th. This is what I ordered:
iMac 27" quad-core i7
2TB hard drive/4gb memory
and apple remote
regular free shipping
this was all under the education discount. The total came out to be $2,511.30
I printed off the receipt with that total on it.
Apple emailed me a confirmation minutes later to my email. I happen to study it tonight and the total price on the email was $2,462.39
why is cheaper then the reciept I printed off? I'm obviously not complaining, just though it was weird. What you guys think?