Just got back from Cancun/Cozumel, and this process wasn't very productive. I met with a doctor (who after seeing I was an American, immediately offered to write a prescription for Valium) who asked for $45 for a consultation--I haggled him down to $40, but still steep--though he was willing to write a script for both me and my girlfriend.
NO oxycodone available. I spent close to 25 minutes going through the drug book with the doc to find an effective narcotic pain reliver. He wanted to give me neopercodan (not like percodan, which I had heard on this board). I declined and we kept looking. He offered temurgesic, which was recommended on this board, but we called around and couldn't find a pharmacy that stocked it!?! Ended up with Tylox (Tylenol 3 in capsule form) at about $1 each, but the whole process was disappointing.
Sorry I can't offer more help.