Some of these books are discounted up to 30 percent off the retail price. The site contains a description of each book available and book reviews by readers. When you receive the results of the search, look at the bottom of the list. There will be several associated categories you can choose to retrieve even more books on the topic. Other useful resources on the web include mailing lists, conferences, and bulletin boards.
Users can leave messages for other users and respond to messages at their own convenience.
I should note that this is a mailing list that tends to vacillate frequently. There have been periods during which months have gone by without a post. Also, there is a tendency for users of this site to meander off topic, but the individuals seem genuinely interested in helping one another. You may also find useful information on alt.support.opp-defiant. If you are not sure how to access newsgroups, try contacting your service provider for help.