A Quaker True Delights granola bar that sounds divine: http://www.quakertruedelights.com/
Walmart's free samples page: http://walmart.triaddigital.com/In-Stores-Now-free-samples.aspx
These are always changing. We don't expect to need formula, but if you do, you can request a sample of their Parent's Choice brand formula.
You can find these freebies and other great deals on The Frugal Girls! blog
I especially like their breakdown of what coupons to use at what stores to get items for free, almost free, or really good prices!