It's pretty easy to get a 1e PHB & DMG, I just picked up a copy of each at Gen Con for $10 apiece.
Now, I couldn't see myself playing in a 1e game under normal circumstances, and defnitely not running one, but I find it fascinatng for the historic/research value of seeing where our game has come from, the way things used to be done, and when certain things were added (or removed) from the game.
One thing I saw there that would really bring a tear to Diaglo's eye would be the fact I saw somebody buy an original copy of the original 1974 version he cherishes, and paid $150 for it. Dunno if he wanted it to play, or for library purposes, but I know that was the first time my eyes ever caught sight of those little booklets.