Tarrifs and Taxes, Lets discuss

I am making a decision on where I am about to order my miner from and I am trying to get an understanding on the international shipping process. If I order from BITMAIN, it gives me the price of the miner and that taxes on it. When would I pay the tariff? Is it to be included? Would I get a separate bill?
I have been talking to BIGSKYASIC and want to know if anyone here has any experience. I would much rather buy in the US but I do not want to get scammed. Can we vet this company once and for all.