Update: Creator Log Cabin is also on sale for $19.99 (reg.$29.99). Thanks chenwaa123. 
Kmart USA currently has LEGO Creator 5891 Apple Tree House on sale for $34 (reg.$44.99). Savings works out to be 24% off. Free shipping on orders above $49. Use the online toy coupon code KTOYS5 for an extra $5 off $50 or KTOYS10 for an extra $10 off $100. Thanks to forum member dho7622u for the news.
