Cheap international flights to Tokyo in particular?

I need to find DIRT Cheap tickets from either Miami, Orlando, or Atlanta to Tokyo (Narita Airport). I am practically willing to fly in the cargo area lol. I just need to find some really cheap tickets. It's easy to find very cheap tickets for domestic flights.. but international flights never have any truly affordable options. Does anyone have any way that they can think of to help me? Thanks for all of your help!