Tax will be based on where in the world they operate from, and you see this being implemented more and more from various online outlets. If you've got an in-house warehouse/service center/call-center/retail outlet/etc operation in some state...you tax in that state. The details get a little complcated, but that's the gist.
$218, net, shipped, with two accessories is still the best apples-to-apples deal I could find, by a fair margin. The fact that it doesn't beat some arbitrary threshold of good deals is kind of irrelevant if you've got plans for this thing.