What you end up paying is:
US$339 + 15% tax + brokerage charge.
If you ship with USPS, the brokerage fee will be a fixed CAD$5, collected by Canada post. I was told that you should avoid using UPS ground service as they may charge very high fees which makes the deal not a deal anymore.
I have personal experience with buying from US and use USPS as shippment and it works out twice for me. Just for your reference.
fad