1) Amazon is good at anticipating demand, so they can make sure some deodorant is always at a fulfillment center near you. 2) Overnight shipping is cheap if th

1) Amazon is good at anticipating demand, so they can make sure some deodorant is always at a fulfillment center near you. 2) Overnight shipping is cheap if the distance is short, because then it's really just "shipping a short distance, which happens to be during the night". 3) You still have to pay shipping at Safeway, and you also have to pay for Safeway's smaller economy-of-scale inventory system. 4) Amazon wants you to love shopping with them, and they play the long game. They'll take a loss on deodorant to win a customer.