Valid September 20 – 26 in USA only.
Update: Star Wars is no longer on sale at the online site.
ToysRUs is offering a Buy 2 Get 1 FREE LEGO Sale. This is a pretty good sale and is a great time to pick up their exclusive sets. such as the 7754 Mon Calamari Star Cruiser set. Thanks to kevin93 for the news.
*Star Wars is excluded. The free item is of equal or lesser value. However, the online site does have Star Wars included for the sale.