That sounds a little high to me. It's a healthy drive for sure, but I'm thinking more like $120 USD roundtrip. Of course, going at night and if they wait for you then that could contribute to a higher price. I definitely agree with Carols's advice. If you have other trips in mind and don't want to drive see if you can package everything into one combo price. I just did this exact thing in Mallorca, Spain with a company called TaxiTour Mallorca and excursions we took on six different days were rolled into one package price of 330 euros. It was money well spent in my opinion.
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