We used to have a permanent tax holiday called Amazon.com, but the state of AZ sued them, and I guess since we have 2 or 3 distribution centers here, they now charge us tax. :/
Hate to burst your bubble, but you never had a legal tax holiday on Amazon. It has always been and continues to be the responsibility of online shoppers to pay sales tax on all online purchases as part of their annual income tax filing. Given that almost no one does this, certain states have taken it upon themselves to put the burden on the seller to collect said tax.
You never had a tax holiday; you were simply engaging in tax evasion.