It is certainly purchaseable. It requires that you purchase another adventure at this time.
It would, in fact, be impossible to review one of these adventures (from Open Gaming) until after they become "unpurchasable" (i.e. only available if you patronize a later adventure) because they don't exist in final form until that point.
Should this have been reviewed? Absolutely.
Open gaming has consistently been nominated (and won) ennies, and for good reason. The adventures from them/Wolfgang Baur are consistently 5 star quality.
I have to agree with the wiki that this is likely the best
4e adventure in existence at this time (from what I have seen). For many people, the cost and complications of the Open Gaming business model are well worth it.
And yet another word from our sponsors
