http://www.bringfido.com/freebies.htm

http://www.stayswetlonger.com/freesamples/freesamples.php

http://www.dreammakers.net/assoc/FreeSense.cfm?CallID=697&AccessCode=vine

http://us.sensodyne.com/Freesamples.aspx

http://www.noctua.at/main.php?show=promo_order&lng=en -apparently they request a proof of purchase after you send the form now

http://www.drinkpurple.com/freesample.htm

Link -make an account and upload your pictures, then select the 20 that you want to print. When you checkout, use promo code: PRINTFREE to get free shipping.