With the reveal that the 5e PHB is likely to cost $50, there has been a lot of discussion on several threads about how much books cost, and what that means in terms of inflation. Since the data is getting scattered, and since I have most of it handy (and don't want to have to track it down again in another few months), I thought I'd gather it here.
For reference, the inflation calculator I've used is here.
1st Edition: The Monster Manual was $9.95 in 1977 (Dragon 11). The PHB was published in 1978 (an advert appears in Dragon 18) but no price has been confirmed. The DMG was $15 in 1979 (Dragon 33, Sage Advice). This equates to $38.41 for the MM and $48.33 for the DMG today.
(My best guess for the PHB price would be $10, the same as the MM, which would be $35.88 today. This would give a total of approx $123 for the set. But please note that this is a guess!)
2nd Ed: PHB $20, DMG $18, MC1 $18, 1989. Prices taken from the back covers of the book, except the MC which came from Dragon's Previews from that time. This equates to $37.73 + $33.96 + $33.96 = approx $106 today. (Note that this gives a fairly narrow selection of monsters. To get a set comparable to any other edition, albeit a little more than the 1st Ed MM, you would also need MC2, adding $15 ($28.30) to the price.)
2nd Ed "Black Cover": PHB $25, DMG $20, MM $25, 1995. Prices taken from back covers of the book, except the DMG which came from Dragon's Previews from that time. This equates to $38.37 + $30.70 + $38.37 = approx $108 today.
3e: PHB $30, DMG $30, MM $30, 2000. Prices are for the second printing onwards - the first printing was $20 each, but this was a nefarious plot by WotC to give us an especially good deal. This equates to 3 x $40.75 = approx $122 today.
3.5e: PHB, DMG, MM $30, 2003. Prices are taken from the back cover of the books. This equates to 3 x $38.14 = approx $116 today.
4e: PHB, DMG, MM $35, 2008. Prices are taken from the back cover of the books. This equates to 3 x $38.03 = approx $116 today.
Essentials: One of two "Heroes of..." books, $20, "DM's Kit" $40, and "Monster Vault", $30, 2010. That equates to $21.45 + $42.91 + £32.18 = approx $96.50 today. (Note, however, that this gives a very narrow selection of classes. To get a set comparable to any previous PHB you would need the second "Heroes of..." book, adding a further $20 to the cost.)
Just for completeness, and I know it's not really an edition of D&D:
Pathfinder: Core Rulebook $50, Bestiary $40, 2009. Prices are taken from the back cover of the books. This equates to $54.52 + $43.61 = approx $98 today.
Some notes:
- I don't really have any agenda here, except to share some facts. Well, that and to gather the information so I don't need to track it down again at some future time.
- I'm pretty sure those books are all priced as at release, so these figures should be accurate. It is, of course, possible I've made a mistake somewhere along the line.
- I haven't included the 1st Ed "orange spine" reprints here, because I don't have accurate data for those books.
I hope this is of at least a little use (or maybe interest) to someone!