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I heard about this freebie through Freebie Ninja on Facebook. Because this freebie is through Walmart, I`m sure it`s legitimate. Plus, I get lots of samples through Freebie Ninja, and I trust him as a source for samples. If you want to get lots of free stuff, I recommend liking his page to get updates on the latest freebies.
You can get it at http://wm6.walmart.com/listerine.aspx#DeeperClean