What my fiance and I are doing right now is talking to travel agents. They are able to give us "group rates" for July 2013. Even those those prices aren't "set" they give us a general idea of the price, and they also give us a general idea of how much the price can fluctuate. You could ask your TA about this. We haven't looked into the GP but we have looked into quite a few others and they have been able to give us group rates for our wedding in July 2013. Generally they won't have room availability or actual prices until 1 year prior, so you probably wont be able to get "set" prices until 1 year before, and you can make your decision then, and send your STD's as soon as you decide. That is our plan right now, hope this can help!