How much does a two bedroom mansion cost in Tokyo?

Question:

Approximately, how much is a two bedroom mansion(マンション) in Tokyo for sale?

I know the prices can vary a lot depending on the neighborhoods. I would like to avoid the most expensive areas such as Meguro or Shinjuku. But I would like to live by Yamanote-line.
I'm not looking for any fancy, newest mansions, but nothing old, slum-like either.

What would be the price range for my criteria?

Answer:

At least, 30,000,000 yen, I guess.
it depends on the nearest station, distance from the station, age of that building and so on.
Anyway I recommends you to decide the station, not the line.