The Gunslinger The Drawing of the Three The Waste Lands Wizard and Glass Wolves of the Calla Song of Susannah The Dark Tower
Of course, you should also check out the related books - for complete information, check my Dark Tower and Related Books Guide by copying and pasting the following URL:
Also note that the original The Gunslinger is a very different version from the revised edition (which you'll find much more easily). The revised edition fits with the Dark Tower story much better, although it creates some discrepancies with The Drawing of the Three and The Wastelands. It also has 37 more pages because of the revisions.
If you are just wanting them to read, I suggest trying to find an online site that has the entire series discounted, but in hardcover. You'll want to read them more than once. I got my set online several years ago for about half what brick-and-mortar stores were selling them (Barnes and Noble, not ebay, however). If you are a collector looking for first editions, it will be much more difficult, since the original DT was such a limited release, and can easily command in the hundreds of dollars for one book.
Finally (and I'll leave you alone after this), if you have any questions at all about the Dark Tower series and related books, do not hesitate to ask. I consider myself a slight expert on the series, and do own several reference books on the series; however, I often disagree with or have more information than the reference books I own...although they are decent in their own right.
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