Ok ... make it simple, if you order from BH, and mail to B.C. then you only pay Canadian tax (HST/GST whatever) plus handling fee .. and duty .. depends on your luck.
If you go to BH store in NY, buy something, so pay the 9.5% state tax, and then when you bring the camera back, you suppose to pay the HST/GST/Duty etc ..
Well I bought a mark III, but he photo was done with a Mark II about 2 yrs ago. It was to answer Happy Cow about the needs on high ISO IQ. For those I do anyway.
And by the way EL, where u get it? I haven't started research on pricing .. I ususually order from BH if I buy from US, not sure if better price from other store.