I don't think there is tax when I purchased mine.. I think only domestic seller would require tax payment.
$150 shipping cost is about $60-70 too much for package its size.
I regularly receive packages from China/Taiwan, shipping cost has gone insane in the last 2-3 year, with Trump tariffs, bicycle cost from Asia are likely to go up soon.
BTW, OEM saddle on the Java is horrible, might look lightweight, but very little cushion, stiff shell, very little comfort. Combined with stiff frame and wheels, the ride is very harsh with narrow OEM tires pumped up to 75-80 psi.