It's been offered a few times in the past, but if you missed out before, you can once again request a free sample of Free Woolite Extra Dark Care Detergent. To get your free sample, you'll need to like the Health Lives Happy Homes page and fill out the registration form.
Presumably, this promotion ends when they run out of free samples (they started with 100,000). Get yours while you can!
Thanks to forum member suziecute for letting us know about this freebie.