Cultured marble price question

[Bienes Raices]

I started a thread about replacing the bathroom tiles and then someone else started one about their cultured marble installation (unfortunately I was not able to find that thread again.

I was quoted $1800 by a company here in Orlando to do the cultured marble (in a shower--no tub). I was under the impression that the price range should be $500-$700 for this. I am clarifying with the company what kind of materials they are using, but is there some type of material I should be specifying in the quotes so that I don't get these very high estimates? (obviously I'm not going to pay that much to do this in a rental). Thanks.