Walmart.com has a free samples page and right now they are offering free samples of Pampers Extra Protection diapers (your choice of size 4 or 5). Click here to go to the page, then click "Get your free sample," then fill out the form and that's it.
A while ago I sent off for the Goodnights sample and it arrived very quickly along with several coupons for $2 off a package.
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