I just emailed Johnson & Johnson, Aveeno, John Frieda and Danone and asked if they had any coupons available by mail. I've never done this before and I hope it works.
ETA: Nothing available from John Frieda.
ETA2: Danone said they'd send me some coupons by mail!
ETA3: Johnson & Johnson and Aveeno both said they's sent me some coupons by mail! and referred me to Living Well.