There were no new copies of MP3 in the Gamestop I visited today (Hampton, VA) but there was a used copy, which I found odd.

 that is odd, who would trade in a great game like that? must have stole it from a friend and pawned it.

The Wal-Mart in my area had maybe 4 or 5 copies on Tuesday when I bought mine. I went back today and they were all sold out. I live in the middle of nowhere. This Wal-Mart is the only store for about 100 miles around that even sells video games. Speaking of which, I can tell you that this Wal-Mart doesn't close at night because of crime reasons, it closes at night because there is NO ONE out and about after 10 PM. (Actually the Wal-Mart here might close at 9. I'm not even joking.) There are still some very rural areas left in this country.

I'm originally from Cincy, but moved to Colorado about 5 years ago.

 On topic, I was at Target today and they were completely sold out.  I don't know how many they got though.

One of the game design teachers I know at my school told me about how he wanted to get the game on launch day but had other prior engagements.

When he finally tried to buy it, it was sold out.

A surprising number of people will buy a game like this, play it non-stop, beat it in 2 or 3 days, and trade it in.  You get some of your money back that way, but really, the game is awesome.  I'm going to want to play through it again, and let my friends play it, etc.  Doesn't make sense to me, but a lot what people do doesn't make sense to me.  :)

 you mean like buying PS3s?