Not sure about Canada but my friend is forever buying banjos from the US and importing them into the UK. There is a heavy import tax on imported instruments into the UK but not on banjo spares. His way is to get the seller to dismantle the banjo and send it in bits minus the head and strings. When he gets it all he has to do is reassemble it and fit a new head and strings. It is also much easier to package as well.
Bill