www.craigslist.com (or www.craiglist.com) might be what you're looking for.

Speaking of kitties, there's a house on my walk home from the bus that just had kittens. I was looking at them sleep today and a lady offered me one. Sadly, the fact that the little furball would practically put me in the hospital if I got closer than 5 feet away from it prevented me from taking it home. It was really cute tho...