It's not always a simple answer, and varies state to state. Here in FL, you are supposed to pay sales tax on online out of state purchases, but the burden is on you, and honestly no one actually pays it. I guess if they found out about it, they could make you pay.
Rainier Arms is a great vendor of Noveske, and they sell below the MSRP, and have cheap flat rate shipping. But they are in WA, so I am sure they would charge you taxes. Maybe you can pick up directly from them? Save the shipping and FFL transfer...

