International laws prohibit trade in endangered wildlife, so don't buy any plants or animals, even if they're readily for sale. Do not buy any kind of sea-turtle products (including jewelry); wild birds; lizard, snake, or cat skins; corals; or orchids (except those grown commercially). No matter how unique, beautiful, insignificant, or inexpensive it might seem, your purchase will directly contribute to the further hunting of endangered species.
At most stores and shops, sales and import taxes have already been figured into the display price, and it is not normal to haggle. You can however bargain a price down (within reason) in more informal settings such as city markets.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.