Yeah, I recently posted a couple wanted ads for 2 different games I wanted. I got 2 local good/fair deals out of them, 100% success rate so far with that route!

I'd advise, whenever you have the chance, ask people what games they own! When people come by to check out your machine on craigslist, ask them what they own, and if anything grabs your interest, politely ask them if they want to sell it! This was how I found a pretty nice Gottlieb 2001(a game that was on my wishlist) for pretty cheap recently...