I'm pro-breastfeeding and am not in any way using this to promote formula, but I'm also pro-mom and think that you should do what works for you, and I know that even with WIC formula can get expensive, this woman found a way to use the formula companies to get it free:
http://www.fatwallet.com/forums/messageview.php?catid=57&threadid=328978
Though I love fatwallet.com, I haven't read everything on it so I appologise in advance if there is any offensive stuff on there.
Dude.. that's pretty freaking clever.
A person down the page on your fatwallet link,"Queenofthehivemomof5" listed some places to sign up for baby stuff including formula that she got from someone else.It looks good!