Update: The coupon only applies to LEGO that has the “Toys and Games” logo next to the image.
Barnes&Noble.com has a 40% off coupon for “select LEGO items” their Toys & Games department, coupon code “L9C4L9K”. I tested it out on Echo Base and it worked, so I’m not sure what’s excluded. You may end up paying tax but you get free shipping on orders over $25, and if you’re a member you get free Express Shipping. Coupon expires July 12. Happy shopping!