At least one lucky bastard got it early by Lego error:
http://www.eurobricks.com/forum/index.php?showtopic=70696&st=390
Read from post #399 down.
But otherwise, I only started seeing most of the Monster sets at Target/Walmart a couple weeks ago. Not that I scope out the Lego section every week...not every week.
Early and cheap - before they raised the price