Even though I'm a fan of early Dungeons & Dragons, my entry into the game was via the Holmes basic set, followed by the hardback Advanced D&D books. It wasn't till decades later that I found some of the original supplements (in good condition) in a used basic set purchased from a hobby store.
Now my collection is closer to completion. I was able to acquire a copy The Underworld & Wilderness Adventures, the third volume of the original edition of Dungeons and Dragons, as well as the second supplement, Blackmoor, both for a reasonable price.I already have the other supplements--Greyhawk, Eldrich Wizardry, Gods Demigods & Heroes, and Swords & Spells. So to round out my colletion of original D&D books, I need to track down the first two volumes; Men & Magic and Monsters & Treasure.