First try getting old school photos by using one of multiple websites that are completely free and have millions of school photos from across the country. Popular sites are Find School Pictures and World School Photographs.
Another option to access old school photos is to look up friends from school who might have yearbooks or photos of school events. Even without someone's address or telephone number, it's very easy to find that information, or sites like Grad Finder can help. Also, many schools have actual copies of yearbooks or websites that people can access to get their old school photos. Use a camera or phone and photograph the photos to download to a computer later.