Two of our friends leaving on Thursday ( tomorrow) got tested with the PCR test in Melaque tuesday morning between 7h and 8h. The test results came back by email today Wednesday at 18h30.They are leaving early tomorrow for their noon flight in P.V. So everything went according to what has been mentioned in some other posts. They paid 3500 pesos each for the test.
FYI, i talked to Dr. Gaby yesterday and she has ordered some PCR tests that should arrive in La Manzanilla in a week or so. She told me it would cost ONLY 3000 pesos for each test and results can be back from PV within 48 hours.