When searching for a used bike on Kijiji (A Online Canadian Buy & Sell) it has a neat little feature when trying to narrow down the results. After choosing your local city, click on the "Sports, Bikes" listing. You will find quite a long list that will mostly consist of used sports equipment, but if you put in "bike" in the search field, it will automatically conduct a search that includes "bike OR bikes OR OR bicycle OR bicycles". Pretty slick. Happy hunting!