Labor and parts Cost to replace engine in 09 Subaru Outback

What is your question?

I have taken my 09 Subaru Outback to two mechanics and have heard from both of them that I need a new engine due to a bad bearing that causes a knock around 4k RPM. They could not tell me why it happened, only that the current state requires a new engine. What is the labor to replace the engine, and what is the parts cost? Is it cheaper for me to buy the engine and then give it to the shop? Thanks