James is right, most 2E products are out-of-print and can be obtained -- often less than sticker price except the rare ones -- on used places, Amazon, Ebay. 3 of the core rulebooks were reprinted a couple years ago and may still be sold new in some hobby shops and online (Player's Handbook, DMG, and Monster Manual... the reprints with the green diamond covers). The game can be played with just these 3 (or honestly with just the PHB). These are the only ones available "NEW" at cover price. A website called DNDclassics sells any official PDF's that are available digitally , however I don't believe they sell the core rulebooks in that format, just modules and supplements. The total product-line with all the supplements though, is voluminous. It's many years of collecting. Don't know if anyone has ever made a complete set. There are tons of settings and supporting products, alternate rulebooks, historical settings, easily more than 500 products in the line published between 1989-2000! Some other websites like Dragonsfoot Forum are especially good for threads recommending which books to get, depending on what type of campaign you might want to run. Another nice fan website is called Purple Worm. <a href="http://www.purpleworm.org/" rel="nofollow">http://www.purpleworm.org/</a> I will also PM you a link to join the 2E Tavern here on Roll20 (public LFG link). It is a group for 2nd Edition enthusiasts that I started to support playing this game system on Roll20 interface. People there share various clones (For Gold & Glory, and Myth & Magic are two known descendants of 2E), blogs, API's, and spreadsheets that help to re-compile the 2nd Edition rules. I think this will help supplement your collecting nicely.