Can you give me a ball park figure for the cost of the project?

The ball park estimates for the project were way off.

Can you give me a ball park estimate for the project?

I made some ball park estimations for the project.

Can you give me a ball park estimation of how much the project will cost?

I made some ball-park estimations for the project.

Can you give me a ball-park estimation of how much the project will cost?

The ball park figures for the project's budget were way off.

The ball-park estimates for the project were way off.

He keeps the ball rolling by organizing regular team meetings.