NO duty or brokerage fees is charged on any parcel regardless of the shipper if the value of the goods is under $20.00 Cdn.
If over $20.00
USPS/Canada Post regular mail or parcel post is $5.00 brokerage fee plus applicable duty/GST
UPS rates are on a sliding scale and are posted on their web site
http://www.ups.com/content/ca/en/shi...ration+Charges
add and additonal $7.00 for their disbursement fees.
Fedex brokerage fees are slightly cheaper.
Another option is to ship by UPS/Fedex and have it delivered to a mailbox outlet in Blaine, drive down and pick up. You will only have to pay the appropriate duty and taxes when you cross back into Canada. Mailbox International in Blaine priovides this service or
http://www.thelettercarrier.com/index.htm in Point Roberts.
Of course if you don't live in the Lower Mainland it's not much use
Hope this helps.