I ordered a copy of wave 2 using a US shipping address. Before going to PayPal it confirmed a total of $80 but my PayPal account was billed 91.23, which leads me to believe that I was billed duty, despite the US shipping address.
Any suggestions on what would be the easiest way to correct?
EDIT: The contact options on the site for orders only has the option to change shipping address or cancel the order.
Definitely submit a support ticket. Those guys are a bit swamped right now (tickets are handled first in / first out), but that's the surest way to get the problem resolved. They'll be able to look up your individual account and there is a system in place so that your issue won't fall through the cracks.