I wouldn't worry about the live sand. Just get dry arragonite sand from the lfs. It will become live quick enough from the LR. Many people debate how much life is in the live sand to begin with. Most life forms need oxygen to live and there is no (or very little) oxygen in those bags.
If you know someone nearby with a tank you can ask for a cup or two of their sand to seed yours.
Finally someone sees my point about live sand! Karma for Lynn!