Here's something to remember- when you're sitting in the hospital and they roll the baby in to you, below the baby is a ton of supplies like blankets, diapers and formula. Deplete that excrement on an hourly basis, or when shifts change. Use every opportunity to grab as much of the free diapers and formula as you can, and keep asking them to restock it for you. Also, when you're about to check out and bring the baby home, ask them to give you some parting gifts- they always do.
Congrats on the pending arrival. You'll find that being a parent for the first time is truly a mind-blowing experience.