Not only the price is way off but a little advice here if you do not know what animal you are looking at than do not get it because it is a good deal (whether it's craigslist or any other site), this particular animal is not really what I would call a beginner snake (and definitely not the type of animal I would get of craigslist.). Before getting an animal know what animal you are getting and know if whether or not it is the right snake for you and you can meet it's need.
If you find a black blood or a blood for a price to good to be true it's probably just that.