All the games are cheaper then MSRP online because the online retailers work on razor thin profit margins and make a profit by selling bulk, not at MSRP.
I was wondering the same thing... Wrath of Ashardalon is so much more expensive than the other two games and I don't know why. Castle Ravenloft is 50 on Amazon and Legend of Drizzt is 40. Whereas Ashardalon goes for around $75, which is above the MSRP.
If you don't have the other two yet just pick one of those up first and wait for the 2nd printing. After you play one, you will end up getting them all I guarantee it.
