Question for professional tattoo artists...

I am putting together a library/gallery of designs for people to choose from or get inspiration from when coming to a tattoo shop. A lot of tattoo shops have a lot of designs in books or in frames on the wall for people to look at. Can you recommend a good place to get these, or a good alternative to the traditional (non-unique) selection that most tattoo shops offer? I want to put together a really high-quality selection, without a lot of generic crap.