ALMOST $600!!!

I just received my N810, and after weeks and weeks of searching for a good price I feel like I paid the highest. Get this, I ordered a brand new one off ebay for US $435 + $30 for USPS shipping. The Canadian dollar at the time was trading at higher than the US. However, by the time PayPal calculated things out, I had paid "$479" Canadian. I thought I could avoid the PST/GST using USPS, as I was never required to pay anything extra on packages coming in from the States via USPS -- but when I received the item from Canada post, I was required to pay an additional $110 in PST and GST!!! I wonder if it's because it was shipped using "USPS express" ? When I add everything up, that puts my grand total at almost $600 for this N810. Jesus Christ!! I don't even feel like opening the box.