There's a person selling a 55g glass tank and she's got some fish in it. There's a yellow tang, a skunk clown, a trigger fish an this one. Is it a damsel of some sort?
There's a fair bit of color variance among coral beauties. Mine has more red, purple, and yellow than that one. If you are getting live rock, sand, and equipment, I'd say the price is very good. Otherwise, I'm not sure. Is the tank drilled?