Just buy it in the States, it will usually be less expensive and saves you the hassle of lugging it around in a suitcase.
Check this out as well:
Alcohol -- You are allowed to bring in
one liter (33.8 fluid ounces) of an
alcoholic beverage (liquor, beer, wine, etc.) as part of your duty-free exemption if you are 21 (Customs officials say youths returning home from spring break often violate this one) and the beverage is a gift or for your own use. (This allowance is subject to state laws -- check yours out before you leave on your trip. And don't forget, federal laws prohibit the shipping of alcoholic beverages by mail within the U.S..) If you want to bring back more for your personal use -- unusually large amounts raise red flags about your intentions for the product -- you can. But you will be charged duty and
Internal Revenue Service tax. (FYI, the U.S. Customs and Border Protection enforces these laws on behalf of the
Bureau of Alcohol, Tobacco and Firearms (ATF). This means they are within their rights to decide that these products are being brought in for commercial purposes and to hold the alcohol until you obtain a permit to import it.) Finally, importation of
absinthe, a potent green liqueur flavored with European wormwood, or any other liquor or liqueur containing an excess of Artemisia absinthium (wormwood) is prohibited.
TP