free, free, free!!!
MySavings.com is my favorite source. They have tons of samples and offers by category.
All You has a daily free sample.
Sign up with your favorite restaurant for their email club to get special offers sent to your inbox.
There are tons of freebie menu items available on your birthday. Make sure you sign up way in advance of your birthday, and present your offer from your email at time of ordering.
Brands on Facebook. Look for the free sample tab on pages you like.