There are usually a ton of freebie offers at walmart.com. (If you don't see any, try back in a bit, it means they ran out but they update often!)

And you don't even have to give them your e-mail address, which means no annoying spam. :)

1.) Go to www.walmart.com
2.) Hover your cursor over the tab "In Stores Now," and click "free samples"
3.) Go nuts.