Majority of my books (and I have a lot) was bought used. This, because the really great books aren't available in "new version"...it exist great actual books also, but the "old classicals not... I'm on continuous guest of antiquarian's :)

For exemple, I bought this series (21 volume) with 450 RON (romanian money), it is around $100. It was cheap at all, and it is in a very good condition. Was bought from an individual seller from Facebook, not from antiquarian (antiquarians ask for this series at least $500)