If you’re looking to buy used camera gear on sites like eBay or Craigslist, a trick you can use to find a good deals is to search for listings that contain spelling mistakes that keep most people from finding them (e.g. “Canom” instead of “Canon”, or “Mikon” instead of “Nikon”). With less exposure — and therefore less competition — you may be able to win the auctions at far below the item’s value.
Obviously searching for various typos by hand isn’t very efficient, so there’s special typo search engines designed to do the hard work for you. A few that you might want to try out are: FatFingers, TypoHound, TypoBay, and TypoBuddy.