While I know that most store owners/vendors are open to negotiation of their prices, I had no idea the same may be true of pharmacies!
I asked for a medication that I usually fill in Chapala and for which I'm charged 37 to 53 pesos, depending on the pharmacy. At this pharmacy, I was quoted 110 pesos by the woman at the counter. When I walked away, she said she would take 100! How about that? Only a hundred...