When one door closes another one falls on top of you.

One door closes and another opens.

When it (the price) falls to between one or up to two times the price of steel then it (aluminum) will grow into the mass volume market -- not before.

When one door closes, another window opens.

I wouldn't want to put a top on it at the moment. It has still got a lot of wind in its sales.

He who opens a school door, closes a prison.