I just came across this site and thought it might be helpful to some:
http://www.dutycalculator.com/
Simply put in the export and import country, the type of item and the value and it gives you a quote.
I just checked it against my last 2 international purchases that I had to pay customs for and it was spot on.
ETA: I think it's more interesting for sellers who ship international on here as the US and Canada unfortunately aren't listed as import countries. :shame:
http://www.dutycalculator.com/
Simply put in the export and import country, the type of item and the value and it gives you a quote.
I just checked it against my last 2 international purchases that I had to pay customs for and it was spot on.
ETA: I think it's more interesting for sellers who ship international on here as the US and Canada unfortunately aren't listed as import countries. :shame: