Buy One, Get One 50% Off at Toys R Us
Toys R Us is once again holding a Buy One, Get One 50% Off sale on select LEGO sets. It appears that the only exclusions are Star Wars, Pirates of the Caribbean, and Alien Conquest. As the sale is unadvertised, it's unclear how long it will last or whether or not it will be honored in-store. As always, try to buy similarly priced sets in order to maximize the discount.
UPDATE: The Toys R Us email confirms the three themes above are indeed excluded and that this sale will run through Saturday 7/2/11 both online and in-store. Additionally, the Cars 2 sets are discounted 20% this week so that discount will stack with this BOGO50% offer.