Does anyone know of a good professional DVD site that has advanced search features to allow you to search by Single Layer or Double Layer?

Afterdawn.com has a rudimentary search feature based on user input but I was looking for a more comprehensive site like Amazon or dvd.com (neither has this search feature).

If there is no site that is dedicated to this then this would be a worthwile pursuit for any DVD-R enthusiast! $$$ Agree?

Thanks for the help fellas.

Ape