If you like Kingsford Blue, it's a good idea to track the sales at Home Depot. They generally run a sale at Memorial Day (I've heard 4th of July, too) and the prices the past few years have been very good. The trick, of course, is knowing how much to get to make it until the next summer holiday-- it is painful to pay full price in the middle of the winter!
Also, check in on the 'Trading Post' section on this discussion board for all the rumors, innuendos, and inside scoops of upcoming sales.