They have three warehouses. Here you can see a tour.. it's pretty neat:

http://www.anandtech.com/IT/showdoc.aspx?i=2694

This is one of the greatest fallacies commonly repeated in these debates. How do people arrive at the conclusion that the US has one of the highest corporate tax rates? Take the highest federal tax bracket, add it to the highest state tax bracket, and call this number "the corporate tax rate on companies in the US." Nevermind there are states with a zero tax rate. Nevermind that the GAO reports that in a given year between 60 and 70 percent of all companies pay zero federal taxes. There are so many tax breaks that almost no company pays the full amount. In fact, a number of companies end up with a negative tax rate. Yes, a negative tax rate. Not only do they pay no tax, they get paid a rebate from the IRS. Please, don't repeat the fallacy that US companies pay the highest corporate taxes. And question the sources that tell you they do.