No. But there is a forum where you can post Bad Deals:
http://67-72chevytrucks.com/vboard/f...play.php?f=122
One of the things you can do to ease the frustration is have your shipping figured out before you even list it. That way you don't waste time with folks asking for shipping quotes. I find that most ads on here that do NOT include shipping in the cost get 10 "How much to ship to..." questions, and after receiving a quote, most of them pass. Waste of time. If you have shipping included you won't get any "how much" questions and will be more likely to get a serious buyer.
That being said, stuff happens all the time in folks' lives for one reason or another, and if they back out, they back out, nothing you can do about it. You may want to make a note to yourself and just not do business with that person in the future.