Dave Sim sent Matt Dow (that's me), an audio file of a phone conversation he had with somebody else (!?!?!), Kim Preney from Preney print and Litho. The printer of Cerebus from issue I'm-not-sure until issue #300. Turns out Preney had NINETY copies of #300 on their hands.
Kim explains why.
And, Dave is preparing to get them graded and available for sale. More information on A Moment of Cerebus as Dave gets it to me.