Hi ..Terms does not identify a forwarding service but free from China usually means cheapest via China Post and 2/3 wks to a month delivery.
USPS is United States Postal for items shipping from there.
Customs charges can apply to any item valued over $20 canadian and a $9.95 fee charged by Canada Post for collecting ,on delivery..
http://www.cbsa-asfc.gc.ca/import/postal-postale/duty-droits-eng.html
Here is your buyer protection.
http://pages.ebay.ca/help/buy/paypal-buyer-protection.html
Always file claims no later than day 43 from date of payment.