Toysrus.com (Amazon) also has some sets reduced to 50% off (including Dumbledore's Office and the Scorpion Palace). Also, the stores have had many of the small Orient Expedition sets at 50% off (good for parts).
I've noticed the great prices. i'm going to hold back buying KK2 until it's on sale. I saw Hogwarts Castle on sale for 35$!
Sitting in a midnight glade
Firelight dancing off burnished blade
A Forestman sits
Wondering about the next day
But after three mugs of ale
Let it bring what it may.