A couple of things that often confuse new bidders.
Before bidding read the entire description.
Check the Shipping tab for the cost of shipping to Canada. That Free Shipping offer may only apply to US customers.
Allow for the shipping cost when you make your bids.
Remember that any item over $20 Canadian (about $18 US) may also attract duty, sales tax and a brokerage fee.
The most successful bidders Bid Once and Bid Their Maximum. Allow eBay's automatic proxy bidding system to bid for you.