Try some of these places - the majority of them ARE NOT RTF. You will have to install the motor, esc, servos etc.

E-Star Models http://www.estarmodels.com/

Hobby Lobby http://www.hobby-lobby.com/

Nitro Planes http://www.nitroplanes.com/

Hobby People http://www.hobbypeople.net/

Hobby Zone http://www.hobbyzone.com/

Easy Tiger Models http://easytigermodels.com/

These sites should provide a variety of planes to choose from.