I'm a new buyer and whenever you order from Bitmain and pay via btc I hear they want it sent within 2 hours. My question is, say the price is $1650, how can I estimate what the total cost will be so I know whether or not I have enough Bitcoin? I'm in USA so do I need to pay some sort of extra tax? How much is shipping (on average) + Is there some sort of customs fee or something I should be aware of. Thanks so much.