Yeah, I don't know why 1-Stop still has it listed. Bear in mind that the original dagger was based on design input from Chris Carracci, hence "Carracci Dagger" as listed in the older custom catalogs, so it was to an extent a collaborative effort.
I checked with 1-Stop well over a year ago and they didn't have an answer regarding the production knife's release. Shortly after I heard news from other sources that it would probably never happen. Since then I believe Derek reponeded to one of my old postings stating that it was not likely that the Dagger would go into production.
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Usual Suspect
http://www.freeyellow.com/members8/arkhamdrifter/index.html