Is there a good place, especially for those who live in the US, to sell and buy Asian media, perhaps something like eBay but focused on Asian media? I just finished some DVDs that I won't watch again for a long time and figure I should sell them.

There are a few BookOff stores in America - conveniently for you there's (at least) one in LA. I haven't been to that one yet, but they should have Japanese DVDs and music. You can also sell things there, woo!

Check it out: BookOff USA

Keep in mind that selling your media to bookoff won't net you much return. The prices are pretty low, so they usually only pay pennies on the dollar.

You'd probably be better off selling it yourself on ebay or something else.