I note books that are mentioned in seminars and write them in my Daytimer. Then I get them from Amazon. It is better to buy 10 books and find one is life changing than to not get that book. That is the price you pay for knowledge. As we get older, knowledge is harder to glean for we have learned the easy stuff already. The remaining knowledge come as a higher cost. Mistakes, lots of bad books to find the good one, expensive courses and lots of research.
Probably a book store is not the best place to buy a book. Most of my book are very specialized. My favorites.
Getting Things Done David Allen
Patriots James Wetly Rawles
Any Survival Book