A Tambon is a division of an Amphor which is a division of a Province of which there are 76 in Thailand. In Northeast Thailand, the region known as Isaan, there are twenty Provinces. There are OTOP shops and outlets throughout the region and I suggest you make use of them for the best selection and price. I have seen pieces bought in Bangkok for 10,000 Baht that sell at an OTOP outlet for 2,500.