I don't normally do sales alerts as one of my Monday/Wednesday/Friday posts, but today is May the 4th and there are a number of good sales going on.
Toys'R'Us is running a BOGO40% on all Star Wars merchandise, including Lego, until Saturday 5/9.
Lego is running a 10% to 15% discount on select Star Wars sets that ends today. (The link goes to the general "Sales & Deals" section on the Lego website.)
Target is -- unfortunately -- only running a sale on one set and it's not Star Wars related. It is however, a good deal.