If you mail order something in the U.S. and it comes from out of state, then there is no sales tax. In my experience, most U.S. companies will not ship overseas (here be dragons). In some ways it makes sense, there are all kinds of customs and excise issues with doing that.

Even when you are buying in the U.S and getting things shipped to a U.S. address many sites will not accept your credit card billing address information. Often it is impossible to enter your postal code correctly as the “zip code� field on the form only allows digit characters, this prevents the transaction taking place.

One site I tried to use wanted me to scan some photo I.D. with my address on it, as well as both sides of my credit card. I don’t think handing out that much info to someone you have never met is a very smart idea. So told them I would take my business elsewhere. In my experience Amazon is one of the best sites to use for this kind of thing.