I was looking through some of my OD&D items last night and I noted that the price list in my
OCE books was quite different than it was in my 1st print Blackmoor.
OCE had ads for The Dragon, Blackmoor was advertising the upcoming issues of The Strategic Review.
I looked around in the forums here and the information pages here as well as over at Tome of Treasures and found nothing discussing this.
I suspect it changes based purely on a given date.
Might be interesting to accumulate that data. I certainly don't have the collection to do a detail analysis of this.
Just a thought,
Chris