I'm not really sure where to post this question...

If I wanted to purchase, say, 5 liters of a high-end liquor (J Walker Blue label) because I find a really good deal on it outside the US, I know I'm exceeding my 1 liter allowance. But if I was willing to pay a legit duty to US Customs, what would they charge?
For what usually costs around $170 at home, I've seen it on sale for as little as $95 (Taiwan)