Waldek

I am a bit confused with $100 OBC reward. I purchased one recently and was able to redeem to my cruise purchased less than 30 days ago through priceline. However I am trying to get another $100 OBC and it says can't buy anymore on myvegas. I know there is a limit of 2 RCCL rewards per rolling 180 days you can buy, but same reward you can buy once only? is it also within 180 days? and after 180 days I can buy a new one? Anyone purchased $100 OBC reward more than once? When does it let you buy a second (and so on) reward? Anyone knows? 🙂 Waldek