You can get free samples of diapers, wipes, and formula at http://aff.primaryads.com/t.asp?id=15162&e=17826. I wish I had done this BEFORE I had my baby and stocked up!
Stock up as much as you can on free items. A lot of companies will give you free samples of formula, diapers, etc. If you are interested in things like this, you can search google for free baby stuf ...