We, my wife and me habe received twice a PCR Test at " Camapnario Medical Center" in Sitio de Calahonda. Last time my wife only needed an antigen test, to travel back to Germany.
People there are very profesional and polite. After an appointment by phone, I did not have to wait more than 5 mins, even there were a lot of people waiting.
the costs for PCR were 80 € and Antigen 45€.
Maybe the prices have changed to lower, e.g. I payed for PCR in March 21 120 €.
You will get an report (Paper and Mail) in ES and GB, .... very clear with all information you need to pass at the airport gate without problems.