Do you have a Half Price Books in your area? Because you can sometimes find them there, and sometimes they don't bother to check which printing and just price it the same as other printings.
Although some of them are getting savvier about this these days. Still, it wouldn't hurt to check.
Also any other used book stores around. Sometimes you can get amazing bargains. (And sometimes they want $90 for a battered Moldvay boxed set...)
Either way, good luck with your quest!
I've been checking used book stores around me as often as I can. At a Value Village store I found a 2e DMG 8 years ago, and at a used book store I found a copy of Oriental Adventures with its pages falling out for $30.
I don't have very good luck with finding D&D books in the wild, lol!
I may not be - I may not be the fastest - I may not be the tallest - Or the strongest I may not be the best - Or the brightest But one thing I can do better - Than anyone else...That is - To be me (Leonard Nimoy)