Found the mother lode: Heritage Auctions
I’m quite sure this is the source of almost all the best vintage posters on the 'net. It took me a while because they don’t come up in Google image searches when you are searching for large images. You have to go to the page and click the image to actually get hi-res. Pretty sure I’ve just been uploading cropped and compressed versions of many of these posters. I’m going to wait on uploading the next rar archive until I’ve sorted through all of these.
Finally found my holy grail too, it’s from a transparency and needs correction, but check it out: Tom Jung’s style A without the droids!