Please read.
https://bitcointalk.org/index.php?topic=2333230.0The exact same question was asked yesterday almost word for word. It takes a couple minutes to skim through a few pages to what you want on the forum. Don’t repost things that are asked every other day.
For the US it varies based on the cost of the miner and there are import fees. They’re usually quite low and less than $100 per miner IIRC (haven’t bought direct in a while). you’ll pay the customs fees and fill out a few easy forms.