Do you sign up for free samples? I do! I love getting "presents" in the mail all the time and most samples come with really good, high value coupons too. Even if I won't use the product (like baby items, etc), I sign up for the samples any way. I can always find someone who wants the sample and I can use the coupons to trade for ones that I do want.
Here's one of my favorite websites for samples. You can sign up to receive a daily email too that will let you know what the sample of the day is and provide you a link to sign up.
I also like the Walmart sample website.