Update: This appears to be on sale at Yoyo.com too. Forum discussion for Yoyo.com available here. Thanks to forum member picabo for the heads up.
Diapers.com currently has select LEGO sets on sale for 30% off when you use coupon code JOLLY14. Offer expires on December 2nd, 2014. A good buy would be LEGO 70165 Ultra Agents Mission HQ for $97.99 reg.$119.99). With the 30% off coupon, it would work out to be $68.6 (reg.$99.99) which works out to be a grand total of 31% off.
Some sets have been marked up such as LEGO Chima Flying Phoenix Temple for $129.99. With the 30% off coupon, it works out to be $91 (reg.$119.99) or 24% off. Still savings, but just keep in mind that there are markups for some LEGO items. You can check out the full list of LEGO items that qualifies with the 30% off coupon here.
*International shipping available for select items.