Codecademy currently offers post-secondary students a discount on PRO subscriptions. You can find more about that here, in the Student Centre. If you’re a high school student in the United States, your school may also be able to provide you with free PRO, see the Student Centre for more information.
Currently, there is also a 25% off sale going on for Cyber Monday through December 4 (I believe the discount code is CYBER25).