I am a nursing mom but I do like to keep some formula around just in case I get too sick to nurse or I am out and hubby is at home and needs to feed the baby. I am happy to say that I have used less then one can of baby formula and my son is now 10 months old:)
When I had my other two sons though, we did use the the store brand of formula from Walmart. It was a lot cheaper and was just as good as the name brand stuff.
Here is a link to a free sample: