Every state would like to tax online transactions, but they can't do that without Congress, which so far hasn't acted on it. You probably know that state tax can be applied to an online seller if the seller has mortar-and-brick facilities in that state, as does Amazon in some states.

Here in AZ, the legislature briefly asked taxpayers to state, on their AZ tax returns, an estimate of how much they spent in online purchases that year. Some people put down $100 and the state calculated that amount in figuring out your bill. But AZ couldn't apply a tax to every transaction. Most people ignored it. It was revoked, I believe.