Can someone tell me how to tell if a book is a book club book.  I see alot of people that don't want book club books but don't know how to tell.

Usually BCE's are smaller than the Hard Cover released directly from the Publisher. Most Book Club Editions wont have the price on the dust jacket.

Here is a great site with lots of information on the topic:

http://www.bookthink.com/0005/05bce.htm

I have found that a lot of the hardcovers will say Book Club Edition at the bottom right corner of the inside front of the dust jacket, under the synopsis.