My theory is that you just have to keep looking and be ready when opportunity stares you in the face.
I bought a blued 4" that was pretty pristine - no wear to finish, grips, etc. - a year ago. I wanted a "shooter". Mine had no box or paperwork but I was thrilled to get it for $800 and have since then, turned down two offers for it that were each over $1,000. A month after I bought mine, I ran across a blued 6" in a LGS that they had just gotten in and they had it tagged at $800.00. Again, no paperwork or box but was equally as nice as the 4" I had purchased. Like an idiot, I hesitated and decided to think about it overnight. The next day I went back and when the clerk I knew saw me coming, he gave me one of those "you should have bought it yesterday" looks. The clerk told me that right after I had left the day before, another customer that he had seen watching me look the Python over, stepped over and asked to see it. He snatched it up right away.
In my mind, when I bought my Python, I didn't just "buy a gun", I made an investment. I've had it to the range twice since I bought it and it is a beautiful piece of machinery - an excellent shooter and very accrue. But I have to tell you, I'm a more "vintage" type person and I enjoy shooting my 1910 Army Special more - just my preference.
Be patient and prepared and you'll run across one. Good luck!