I don't know where you are but in Michigan, you are required to pay the sales taxes for online purchases when you file your income taxes. I assumes most people don't. Additionally any business with a physical presence in the state in which your residing is required to collect the sales tax for that state. So places like Dell, IBM, HP or any other manufacturer with a physical presence in that state are required to collect those taxes like you were buying it locally in your state. Companies like HP, Dell, IBM have a physical presence in most every state. Then companies like NewEgg are only required to collect sales tax on items sold to people in the states in which they physically reside (California. Tennessee, New Jersey)