Bottom line: final result, net income.
Money talks: those who have money also have power.
Money to burn: a lot of extra money.
Monkey business: dishonest practices.
Cost an arm and leg: to be very expensive.
In the pipeline: in progress, being prepared.
Selling the hotcakes: getting sold quickly, in large numbers. "The latest cell phone model was selling like hotcakes during the first month of its release".
Feather one’s own nest: to use one’s position to get money for oneself. "The director used his connections to feather his own nest".
Keep one’s head above water: to have just enough money to stay in business.
Make ends meet: to have enough money to pay for the things one needs.
Put one’s money where one’s mouth is: to stop talking and start doing something.
Tighten one’s belt: to spend less money.