Do you know if it should work if I've already used an Angel Hack 2015 code? If I try on my regular account, and it doesn't work, can I just use same code on a different account? I almost don't even care for $7, but I just don't want to screw up my main account...
The same promo event will not work twice on the same aws account - You can use it on another account that has not redeemed that particular event though. Nothing will get screwed up, it just won't let you apply codes from the same event, even if it's a different code.