I am hoping to add more to the page, it's pretty basic right now. Best Buy really makes it difficult to extract DVD prices from their webpages. Any other sites which you find you'd like to see compared? Leave it as a comment here.
Hmm...where will I get Airplane: The "Don't Call Me Shirley" edition?
Update: If you get a mismatch on seasons for TV shows, try adding the season number to your list of search terms. Behind the scenes I am just taking the top result from both pages for the search terms entered, and if the result's not what you want, you can click on the amazon or deepdiscountdvd logo to see the other results on that site.