What is the best learning material(s) for $500?

Perhaps you can use that $500 to make a big impact on your personal environment. I.E. get rid of as much english stuff as possible and replace with japanese things, media, radio, etc. Maybe you can use that to get a good set of headphones, etc?

I guess that doesn't fit into the "language learning materials" requirement though. What about subscription to some of the tutor sites like edufire.com ?