LA Guy's right - there is no way that PST, GST, handling and duty should exceed 30% of the price. This is UPS sticking it to you. Call STP and ask if they can ship USPS...
I've asked before. They responded:
Thank you for your recent email. Unfortunately, at this time, we are only set up to send orders via UPS on foreign orders.
Luckily, when shipping to Australia, they only stick it to you on some
of the packages.