Buy Offer - Marine Engines

I am interested in buying used inboard Yanmar marine engines; I would like to know if you can supply me with Yanmar engines (engine and mission) of 1 cylinder, 3 cylinders, and 4 cylinders, how much engines of each item can you provide me with per month? And I would like to have an approximation of the prices of these engines.

Hope to do business with you soon.