That map indicates which states don't have a sales tax at all, i.e. if you purchase something in Oregon, you are not charged a sales tax.
Generally speaking, internet retailers only charge sales tax if they have a presence in the buyer's state and that state has a sales tax. Newegg, which is a California-based company without a presence in Texas, would not charge you a sales tax. So, whether you are charged sales tax on an internet purchase depends on 1) whether your state has a sales tax, and 2) whether the internet retailer has a presence in your state.
ok..that clears it up since texas does charge a sales tax, but since newegg doesnt have a presence, thus no tax...i wasnt aware that canon had a shop in texas, so i thought i could get away with no sales tax.