I started using Member's Mark Infant Formula with Iron and DHA & ARA Lipids with my first child in 2005 and now am using it with my second child born in 2008.  It's a huge savings over Enfamil or Similac, with the same ingredients and nutrients.  If you compare the labels side by side you'll see it's the same, but a larger container and at least 1/3 cheaper than name brand.  When you're buying diapers, baby food, paying for daycare, etc., spending less for the same quality of formula just makes sense!  True you pay $50 a year for a membership to Sam's, but the savings in diapers, formula, milk...