Anyway, they say to call the helpline to get the accurate tariff rate, maybe I'll just have to take the stab and buy one of the miners and see how it goes...
I hope there won't be much headache. I bought decent number of watches, pos printers and other kind of electronic devices from china through alibaba and stuffs kind of websites. Never faced any duty issue or any kind of headache like that.
I wish you good luck.