I called my local gun dealer on Monday a little after 5:00 P.M. and asked him to find me a 4" 17-6. He called me back at 5:30 or thereabout and told me he had found one in Georgia and quoted me the price; I said go. I picked it up today (Wednesday) after I got off work.
Oops! When I originally posted this, I titled it as a 17-6. I apologize to everyone for inadvertently dropping the six! I just wasn't paying close enough attention.