First visit this site http://www.emptymirrorbooks/collecting/firstedition-values.html
There are so many things to consider otherwise you'll just buy a very expensive used book.
But, I guess it's about you and how much it's worth to you, right?
do some research on these books. People on this forum read really heavy stuff, and their twisted black humor (I mean this as a compliment) may not be something your other half likes. Books that you have read so far they read them to their kids. If you have something specific in mind...
NOW that I'm almost done reading Erikson's books you are telling me I should read ICE too? But so many people complained about his writing, many said his books are inferior and some of the Erikson's characters are wrong in his hands. I dismissed them completely because I thought reading them...
Great, can we talk horror now?
I have been reading The Malazan series, after that I would like to try horror. I like the sound of The Passage and also Sidra got interesting recs, I don't know where to start. What would you recommend?