I suggest creating a Bike Wanted ad here and starting a thread in the Buy Sell forum. Be specific about your budget, size and type of bike you are looking for.
I'm sure you'll find a lot of motivated sellers here who are much more knowledgeable than your average Craigslist seller. Plus the other members will be able to give you feedback/advice if needed.
Good luck with your search!
"The song of a bird…We used to ask Ennesson to do bird calls. He could do them. How he could do them, and when he perished, along with him went all those birds…"-Return from the Stars, Stanislaw Lem
"We just walk around, and sometimes we go out and dance, and then we listen to the environment."-Ralf Hutter, Kraftwerk