There is not a lot of described media on television or online. Often you have to check the various websites of describing service providers for TV shows. However, there are some other good general sources:
Audio Description International (ADI) provides information on how to find audio described shows:
http://www.adinternational.org
Also, you can find the local chapter of the American Council of the Blind via http://www.acb.org/affiliates/index.html. Hopefully local ACB members can point you to theatres (movie and stage) that offer described shows, as well as other local services for the blind.