I got all excited till I read the OP and saw its a bunch of one month codes. Instantly too risky for me. Especially for such a small discount. If it was like $20 for a year sub then we might be talking.
I've been looking for the past year or so and haven't seen any discount at all on one year subs. I may end up paying the full $50 in February when my sub expires with no extra bonus like the free Jurassic Park a while ago (knew I should have bought another year then but I thought those kinds of deals would continue and I could get a game I'm more interested in).
You know what I'd like to see? A Playstation Plus discount on Playstation Plus subs. Too meta?