Not so easy, as I said, with different counties having different sales tax, within the same state. Here’s Florida’s 67 counties and you’ll see, not a uniform sales tax. We do collect to things sold within our state, just saying if we have 49 other states with similar variations in sales tax to FL, then it’s going to get “very interesting.”
http://miami.about.com/od/governmentcityservices/a/salestax.htm
Nope very easy, mail order companies only have to worry about state sales tax, cities and counties get stiffed. You would only have to worry about 49 other states if you had a physical presence in those states, and even then you wouldn’t have to worry about cities and counties.