When you browse through the books for sale, and you see a book you would like, pull out your wallet. At the last conference I attended, I saw several books I wanted. I got so busy that I never managed to getback to buy them--I have regretted it off and on for the past four years.
Note: During the Conference, Chapters will be there selling presenters' books, and Black Bond Books selling how-to writing books and related material. Both are set up for cash, debit and credit card sales, if my memory serves me right.