I collect the originals, $70 or less will often buy a real one, with the more desirable ones going from $75-200. But they are a good investment whereas the repos are not. Check E-bay.
BTW, I am looking for one that says "When you ride alone you ride with Hitler" and has a picture of a man riding in a convertable with a line drawing of Hitler in the passenger seat. If you spot an original let me know!