Hi, I bought an HP high spec 17" notebook computer that I'm now typing on from Amazon. At that time, I paid about 60% of the Thai price. There is no duty on computers coming into Thailand, but you will pay 7% VAT, which was included in the price that I paid. It took about 7 - 10 days to get here. We weren't home when it arrived, so the courier gave it to the village maid who placed it on our front porch (see has our gate key), and I was pleased to find it there when we returned. Fired it up. Works great, very fast and a great screen.
Downside: If it fails it might be difficult to repair here as some parts may not be available in Thailand. Also, it is an English only keyboard, but I don't need a Thai keyboard.
Good luck!