ebay is web based transaction. Once you won the bid, it will be shipped to Canada.
Remember:
1) Goto www.ebay.com to buy, there are much more selection on .com than .ca
2) Check the description to see if the item international/canada shipped.
3) Register your Paypal account with your canadian credit card. If you may have more than US$1000 online transaction per year, US$ credit card is useful.
4) Select the seller with NO negative feedback.
5) Bid the item in the last minute.
6) Once winning the item, asked seller NOT to use UPS/Fedex for shipping, Use USPS.