YIKES!!!!!!!!!!!!!!!!! B&H will send you it OVER SEAS and from there you may need to pay an IMPORT TAX I think. But even with the shipping and taxes, the exchange rate should still make the import a WISE choice. But, Sigma may not warranty the lens depending on their warranty type.
As for a fixed 400mm.... Tokina 400mm 5.6 ! USED is the only way to buy it, but mine was worth EVERY penny(and they run $200 or so(US dollars) compared to $500 for the 80-400 which replaced it. The 80-400(as with most zooms) has image quality fall off at the long end. Not real bad, but the fixed is far better at 400mm.
Don't get me wrong, the Sigma 170-500 is a good lens, but you need a steady , solid support to optimize the lens's ability. The faster the shutter speed, the more sharp images.
Now all of the above lenses will NOT focus lightning fast, yet they are not annoyingly slow either ;)