Covid19 PCR test. Where can I get one done ?

Greetings ,

I will need a PCR test done in order to be able to travel.

Would anybody know where I can get one done and how much it costs?

I was told by the Clinica Roca in S. Agustin that they only provide tests if the person has been officially reffered to them by a GP and has symptoms, that's not my case , i just need a test done and the 'hopefully' Negative result provided so that I can show them to the airport authorities on my arrival.

Any idea folks?

Cheers