For those who have Prime and want to pay a little less for these. http://www.amazon.com/Playstation-THUMBSTICKS-2-3-Slim-Original/dp/B00E1ZTCSG/ref=sr_1_7?s=videogames&ie=UTF8&qid=1402818402&sr=1-7&keywords=playstation+4+thumbsticks

Edit: I might be wrong, I'm not sure if the PS3 thumbsticks will work on the PS4.

Edit 2: They are universal. Nevermind http://www.reddit.com/r/PS4/comments/1wyw8a/ps3_thumbsticks_on_ps4_controller/