I got these for pre-ordering a PS4, which is peculiar, as I cancelled my order a few months ago. Amazon decided to thank me for purchasing a console I didn't actually purchase by gifting me codes for £7 off the following:
PlayStation Plus 365 Day Pass: WEBT-3G83UD-QNBW?V
Killzone: Shadow Fall: RDHP-LZ8HZ3-?YKTJ5
Replace the question mark with one the following numbers: 8, 7, 2.
I have no idea if these codes are tied to my account (feel free to lock/delete the thread if so), but if not, happy hunting. The codes expire on December 13.