Start your search on websites that sell DVDs, such as Amazon.com, BN.com or buy.com Many old cartoon shows are available on DVD.
Rummage at yard sales. Many old cartoons were available on VHS but have not yet been released on DVD or Bluray, and yard sales are often the best place to find large collections of old VHS tapes.
Search for episodes that have been uploaded to sites like Hulu and Youtube. This is a good option if you are simply looking to watch old cartoons.
Visit websites that focus on providing cartoons online, such as Toonfind. (See Resources)
Post a message on forums to find leads on hard-to-find cartoons. Try posting on sites like Adult Swim or The Big Cartoon Forum (see Resources).
Send a letter or an email to the company that created the cartoon and see if they can help you find a copy of the cartoon.
Scan the airwaves. Some cable channels, such as Cartoon Network, regularly show old cartoons.