Your worst enemy IMO is the customs. At least here in Canada it is.
They only hold things up if they're over about $20 Canadian. The REAL enemy are the pirates UPS (at least on transborder shipments)
Canada Customs charges(or maybe it's the Post Office, I'm not sure :-? ) a flat $5 fee for brokerage, UPS will hold you upside down and shake all your spare change out of your pockets, kick you in the nads, and bill you for the remaining extortionate brokerage charges sometimes totalling in excess of $40. Boycott anyone who tries to ship UPS across the border! :-x
