I have no plans to get more Star Trek Books

Well I love Star Trek but I don't know if I should get more Star Trek books which that will take time to get more like Deep Space Nine or Voyager and that is hard to find even from our library's book sale and these books are now hard to find since there like very old and no longer being produced. I just have no time to et more either find more and add them to my Star Trek books collection so I still gonna find more if I had the chance to do so.