Obviously, I am a huge fan of getting free samples. While the size of the product may be small, once you've accumulated a couple of them, you'll find that it's pretty nice when you run out of shampoo and you have another one sitting there (even if it's tiny). Plus, you usually get a coupon when you sign up for a sample, and these can come in really handy--I'm getting Dove Men+Care for my boyfriend this week for free because of a coupon that came with a sample!
The best website I've found for free stuff is called Freeflys. You have to go through a kind of annoying signup process (just decline all the offers), but it's a good database of free samples. I check it a couple of times a week, and they're constantly updating it. If you've never been and you want to start sampling, Freeflys is probably the best place to start!