But, truth to tell, you bought all those new computer parts from JIB and then let JIB put them together and deliver the finished computer, didn't you? We'd need a shipping confirmation from Amazon to prove you bought anything from Amazon. Your post is merely dreaming about buying something from Amazon if it weren't for customs & shipping costs.
That said, there's little need for Amazon in Thailand nowadays. True, Amazon has stuff you can't find here but might like to have, and have w/o import tax added. But then you realize that you don't really need it and can find acceptable substitutes. Moreover, returns and support could be an issue w/ Amazon you don't have locally.
Nowadays, Lazada, Shopee, Aliexpress, and Temu, not to mention the big retail outlets, can provide all that's needed except specialty gear. Though some of our old members have problems with them, as with Immigration and god knows what else, I never do. Returns have been painless and refunds issued.