How to contact Warner Bros?

I recently have become extremely interested in the world of Batman. I fell in love with Arkham Asylum earlier this sumner, and soon became obsessed with the franchise as a whole. I have been looking for a copy of Batman: The Complete Aninated Series, but have been unable to find a actual copy anywhere I look (that is, under $300).

So I would like to be able to send an email of complaint to the company, and though I don't expect anything to happen, complain to WB about their crappy handlings of the most beloved series they own (they are notoriously known for their horrible collectors editions) and inform them they are losing an extreme amount of money to criminal bootleggers.

Please help!

Thanks