I went through this exercise a while back randomly sitting on my couch wondering how much it would cost to fill my house with $100 bills. For your purposes, as

I went through this exercise a while back randomly sitting on my couch wondering how much it would cost to fill my house with $100 bills. For your purposes, assuming $100 USD bills, 1m cubed is roughly 71 million USD. A 2000 sqft house with 8 foot ceilings, 42 billion.