Shipping US-CAn and CAN-US, always use USPS/Canada Post. UPS sucks.
ALso on the subject of UPS sucking, they tend to leave packages on our doorstep. Last year we had ~$4000 worth of Pampered Chef stuff left on our doorstep, if anyone driving by knew what that was....well we'd have been in trouble. THey also left my wife's computer on her doorstep (in Ontario at the time)...Ya a big box with "DELL" on the side...maybe broadcasting to thieves??
THis past fall, they left a wedding present from my grandparents on the doorstep...we were away on our honeymoon. The packing slip said "SIGNATURE REQUIRED", but the driver wrote "DR" as in driver released and decided it was ok to leave it on our doorstep. The package was an afghan that my grandmother had been working on for over a year. Needless to say, it went missing. UPS has been very very poor with their customer service and attempted to blame us for not being home to recieve the package... They have yet to refund my family for the insurance/shipping...and we're now in a bit of a battle with the company.
Anyway, moral of the story, Don't ship UPS for anything...they cheat you on brokerage fees and have poor business ethics.
-Gord