I know that I can write some of that off my taxes, but I'm too lazy for that. The following comments are owned by whoever posted them. We are not responsible for them in any way. When I'm finished reading them, they just take up space in the bookcase. Just keep the books.
Bookshelves are cheap.
As far as the cost issue goes, get your employer to buy as much as you can reasonably claim is related to your job. Buy the other ones yourself. And although I am not a tax lawyer or CPA, I do believe that educational expenses related to your job are deductible. And shop around. I find that Bookpool usually beats amazon, sometimes by a lot.