Rare. Made initially exclusive to Wizard World Philly 2003, there was apparently some kind of retail version, although it was held up in litigation. The few retail copies of this thing that exist are fetching relatively high prices on eBay. Existence of a retail version may be only a rumor. Exact cover date, if indeed there was one, is unknown.
Chronologically, this story takes place after the Preview issue, and prior to issue #0.