You can find a used exercise bike in several places online. The best place to check is with a local Freecycle group, available at www.freecycle.org. This organization pairs individuals looking to get rid of their used items and giving them for free to other individuals who will pick up the items. If you are willing to pay for the exercise bike, check your local Craigslist at www.craigslist.com, which also assumes that you will pick up the bike. You may also be able to find a bike in the area at www.ebay.com, or may need to have it shipped.