Hi MOREpower,
I was only referring to that particular single for sale in Boston as being overpriced. The seller is asking $550, and to my eyes it's kind of a "beater". I really don't know what price range to recommend for a nice single. It's all based on what YOU'RE willing to pay and I would think finding a single is quite rare. And decorator versions are rare as well. I would think WA state might be a tough market as far as inventory, but I don't know. Maybe Seattle is fertile Klipsch ground?
I lived in the SF Bay Area for many years and Cornwalls (in pairs) would come up fairly often. I bought a pristine pair in Walnut for $700, but that was well over 10 years ago. Prices have gone up a LOT since the pandemic. I have a really nice pair of CII's in Oak now (bought in New England), and felt I got a good deal at $1600. Don't see them come up here (at least on Craigslist) very often.
Happy Hunting!