In these web pages you can read reviews of the book, get an idea of what the book is about from its preface, and even meet the author.
You can also download solutions to key programming exercises.
Solutions to many of the design exercises are discussed in the book itself. In addition, code suggestions for the Smalltalk exercises in Chapters 8 and 12 are available in this file (approximately 5 KB).
You can purchase Smalltalk, Objects, and Design from any offline or online bookstore, including amazon.com, linked below.
(A note about ISBN numbers: The original edition has two ISBN numbers, 0-13-268335-0 and 1-884777-27-9, but they refer to the same book. The ISBN number of the reprint is 1583484906.)