Negotiating prices at the markets in Oaxaca is a common practice when purchasing certain products, but not at eateries.  Start by showing interest in the product and engaging in friendly conversation with the vendor. Politely ask for the price and then offer a lower price, keeping in mind that the vendor may counter with a higher amount.  Be prepared to negotiate and find a mutually agreeable price. It's important to be respectful throughout the process.  Read our guide to Using Money in Mexico for more money-saving tips for your trip.