First off - welcome!! Nice to have another Cana'jun on board. You'll learn tons here.
Some Walmarts carry Hickory and Mesquite Chunks, as well as a wider variety of chips. Both Ontario Gas BBQ in Vaughan( www.bbqs.com
) and Sobie's in North York ( www.sobies.com
) have wood chunks.
BBQ Beaver's suggestion about kijiji is also good - I've bought apple chunks and splits from kijiji.