Amazon currently has the following sets on a notable discount which I think are good buys. Please keep in mind that prices can change anytime.
LEGO Chima 70009 Worriz Combat Lair
LEGO Castle Forest Ambush
LEGO LOTR 79006 The Council of Elrond
LEGO Star Wars Jabbas Sail Barge
LEGO Star Wars AT-TE
LEGO Friends 41026 Sunshine Harvest
LEGO Friends Dolphin Cruiser
LEGO Ninjago 70724 NinjaCopter Toy
LEGO Disney Princess 41050 Ariel’s Amazing Treasures
LEGO Disney Princess Rapunzel’s Creativity Tower 41054
LEGO Disney Princess 41053 Cinderella’s Dream Carriage
LEGO Disney Princess Ariel’s Magical Kiss 41052
LEGO Disney Princess 41051 Merida’s Highland Games
LEGO Friends Downtown Bakery
LEGO Friends 41037 Stephanie’s Beach House
LEGO Friends 41035 Heartlake Juice Bar