The CM @ our DS in WA said the best sales are in May and June but they never know ahead of time what is going to be marked down. You would almost be better off going to the store early afternoon instead of first thing in the morning because the changes our faxed at the start of the day but it sometimes takes a few hours to get the new prices/signs posted.
As I was talking to the manager, other CM's were doing price changes. The only thing I got a really great deal on was a baby outfit that was $9.99 instead of $39.50.