LEGO is running a promotion this weekend, November 13-15, 2015. Purchase the Temple of Airjitsu (70751), and receive a free Enter the Serpent (70749) set. Enter the Serpent is $59.99 MSRP.
This offer is available in US LEGO Stores and online at LEGO Shop @ Home.
NOTE: Although initially available at LEGO Shop @ Home, it appears to now be in-store only.
Just in case you want to see it, here is the fine print on the offer:
**70749 Enter the Serpent free gift offer is valid through 11:59pm EST November 15 or while supplies last. Purchase must include 70751 Temple of Airjitzu to qualify. One free gift per qualifying purchase. Cannot be applied to previous purchases or combined with any other discount, offer or free gift. Free gift is available exclusively through this offer. Offer valid only in the United States and Canada. Offer is only valid on shop.LEGO.com and LEGO Stores; not valid at LEGOLAND® Parks or LEGOLAND Discovery Centers. Free gift must be returned with the return of 70751 Temple of Airjitzu or free gift will be deducted from return amount. The LEGO Group reserves the right to cancel or modify this promotion at any time without prior notice.