You are welcome to purchase wine during the trip. Please ask the instructor if there is enough time at the end of the visit for you to make your purchase without impeding the progress of the trip. However, not all estates sell at the estate; in Bordeaux, for example, very few of the Classified Growth chateaux sell wine at the chateau (they sell exclusively through wine merchants). American participants should be aware that, according to U.S. law, only a licensed importer can receive foreign shipments of alcohol. So you may want to speak with a local importer before you leave for France, and ask if they will agree to receive a wine shipment for you. For participants from other countries, it is sometimes possible for the estate to ship wine to your home with an additional shipping charge. In any case, you always have the option of bringing wine home with you in your checked luggage. You may have to pay some amount of duty on your wine when you go through customs; please check with your local authorities for further information.