I've read some stuff about UPS charging some additional customs brokerage fee that wasn't based in reality, and not required by any government. Something that lines their pockets, I believe. It's pretty exorbitatnt, I've heard of people paying $20 for a small $5 item, and other cases where someone was charged far more than an item was even worth to ship. I'd highly recommend not using UPS to ship to Canada.
To read more about it:
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