Quoted from PinballTilt:
I wish these were priced lower and I would be all over it. I've got some knockoff non pinball drawings already that go with my steampunk vibe, so these would be perfect. If anyone knows of cheaper reproductions, let me know.
If you can find nice scanned images take a PDF or TIF to a blueprint shop. They should be able to make copies of an original for you and even scan it to a file.
I am sure you can find cool stuff, even if not pinball related on the web.