Half of Craigslisting is pretty much luck. All of the good finds get scooped up immediately.
I randomly happened upon an ad for free non-running Suzuki fa50 two minutes after the guy posted it. Luckily I was the first to call and found out pretty much all it needed was a new spark plug and some tlc. The guy told me he got at least 20 calls after mine before he took down the ad half an hour later.
Be persistent with checking Craigslist and check out other boards from nearby cities or suburbs if you don't mind traveling a little to pick it up.