You can find anything, no matter how odd, on Ebay. I searched gillette safety razor and came up with 252 listings. A very quick look (like 30 seconds) found a "vintage" razor with a 1-9 setting.
You might have to wait a month, and check it every day; but I guarantee you that what you are looking for will show up...it's spooky...LOL!
Thanks, I will look there. I bet that's gonna be a trip, I've never searched there before.