I have found this particular package disappears fairly regularly from the list of potential reservations. So far it's always come back within a day or so. This does not appear to be the case this time - the original poster posted a couple of days ago, but it's still not available.
Can someone in the know please explain any one of the below:
Why it is unavailable so often?
Why it is gone at this time?
When it is expected to be back?