as far as I could tell they have rules but they are fleaxable , i only brought a hadfull of books and dvds and i think the dvds were 1.50 euros each( i think in euros) more than pirate one cost here , they books were around a euro , now the problem is that by no means, means that you will be charged that , or anything , there seems t be a negotiation element as well I would not worry to much about taxes , in theory at least you are able to bring a container in tax free with a correct visa. the main thing is collect the goods yourself, and take a Thai with you , pref an older 'respectable' woman that will help a lot, try to get one of the girls who work there to help you for a small tip she will be worth her weight in gold, and be patient , and smile they can mess you around as much as they wish I was told when i was there that customs officials regard farangs as rude because they lose patience and get angry, i didnt its a long story but it saved me a day and some money