Here is a great list of some of the current free samples out there that have been offered before. Most of them will let you sign up again, The exception is anything on the P&G Solutions pages. Go get some good freebies.
Redken For Men 2-in-1 Conditioning Shampoo
Kleenex – send to a friend
True Lemon, True Lime and True Orange
Pureology Colour style – monthly drawing
Hair Triggered SmoothSmooth Shampoo & Conditioner