Got a note in with my P&G sampler for a survey entry to win 1 of 100 Arm & Hammer gift sets (didn't say what):
Then later it said if selected you could be entered to win 1 of 3 $100 GC's to Amazon. It also asked if I wanted to sign up for several other surveys.
What the heck, I'm in.
It had a code on my card but it also has a place for you to check that you don't have the code any more.