It could be your specific libraries. My library has been increasing its available titles as well as the quantities for bestsellers to reduce wait-times. I would send an email to your library and tell them what books you would like to see added. I know that my library listens to their patrons.
Are the books that you are interested in available in ebook? Sometimes there may be a delay between hardcovers and ebook availability. This problem seems to be improved since agency pricing was implemented. Also sometimes there is a lag-time between when a book is on the NYT list and when it shows up in my library. I am sure they are gauging how popular the book is to determine if it is worth the acquisition costs. Some authors they stock right away and others might take several weeks or months to show up.
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