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Booking a Parador in Spain

What is the best way to check availability and book a Parador in Spain. The websites I have found either make you submit a request and will email you later, or make you give credit card info without knowing the availabilty on your requested date. Is there a way to call directly? BTW, looking at the Carmona Parador for a 1 night stay October 2, 3, or 4th.
Thanks!