On the Sell Your Item form, the first shipping section is Canada.
Choose Flat Rate from the first drop down menu.
Enter the shipping service (Letter?) and the charge.
The next shipping section is International.
Choose Flat Rate.
Choose Custom Location
ChooseUSA
Choose shipping service and the charge.
Then Choose Offer Additional Service
Choose Custom Location
Check off countries you will sell to
Enter charge.
Leave Will Ship WorldWide Alone.
Enter handling charge if not already included in Flat Rate. Bubble wrap ain't free.