I paid $80 (86.30 with sales tax) for mine, just by herself. After doing some research, it seemed that the going price was 125-150. So, if you get a tank and set up out of the deal at $100, I say it's a good arrangement.
You will have to get something a little bigger as someone just mentioned but it will do for now. They pretty much max out at 4 feetlong. My tangerine is 2 1/2 feet long and still quite happy in a 10 gallon, not cramped at all.
Besides, if your baby outgrows this tank, you'll have an excuse to get another snake.