I slowed down with book purchases quite a bit. Now I usually only get what I'll read next, unless it's an entry in a series I'm already committed to. I also avoid getting into unfinished series, unless they are never ending ones.
I'm generally on a more minimalist trip lately where I'm more critical of what I buy, and when. Doesn't work so well in every area of my life (I have eight ukuleles...), but with e-books and games it seems to go okay.