I'm sure that plenty of people are going to tell you to ping Donnie Unger at
Duc Pond Motorsports in Winchester. He will give you a fair price and you'll know exactly what you're buying. He may not necessarily have a used one right now, but he is always turning over his inventory and always has plenty of bikes in on consignment. I'd recommend talking to them first.
If you don't want to work through a dealer, craigslist and cycletrader are your best bets for being able to do local searches.