5. "Why is it so hard to find the hardcovers?" (added in 1.21)
The hardcover editions of the Dark Tower books are published in limited quantities by Donald M. Grant Publisher in Hampton Falls, New Hampshire. The first release of the books that was widely available was in the format called "trade paperback", published by Plume books (that's what I have.) They were then re-formatted and published as "mass market paperbacks", the kind you see at grocery store checkout lines. To my knowledge the trade paperback editions contain the same color plates that the limited edition hardcovers had (book 1 had art by Michael Whelan, book 2 by Phil Hale, and book 3 by Ned Dameron), but the mass market paperbacks do not. There is also a difference in page layout between the tpb and mmpb, but I am not sure if that is true when comparing the hc to the tpb.
You may contact Donald M. Grant at the following address and phone numbers: (added in 1.6)
Donald M. Grant, Publisher, Inc.
P.O. Box 187
Hampton Falls, NH 03844
Customer Service - 1-(603)-778-7191
Toll Free Ordering - 1-800-476-0510 (Visa & MasterCard Accepted)
Link to Donald M. Grant's
Web Page