Food/Music/Apartments

I was wondering if there were any Mexican/Tex-Mex joints in Tokyo, Osaka, or Kyoto and if there were ingredients for masa sold in stores there.

I was also wondering what the average price for CDs are.

And before I forget; what's the usual rent amount for an apartment with its own shower?(doesn't have to be big.)

In Tokyo, I think you can find any kind of food. There are some Mexican Restaurant in Tokyo. So, probably you can visit there and ask them where to buy Mexican groceries.
http://travel.cnn.com/tokyo/eat/5-best-mexican-restaurants-962738

CDs are about \2500 each.

And speaking 'bout apartment, it depends on where to live. But average cost to live in Tokyo with shower room, you should pay at least \60,000.