We live in Canada, we were wondering if you had any ideas of customs fees that could apply while shipping.

Here is a link to the Canada Duty Calculator

Some shipments such as blanks will require a customs broker to clear your produts across the border. 

Here are a few brokers to contact for info:

http://www.shipnorthamerica.com/htmfiles/brokerage.htm

http://www.aacb.com/

http://www.pcb.ca/

Small shipments with USPS do not require a broker.