Amazon customers can thank their drivers with a little extra cash and it won’t cost them a dime. The company has announced that they’ll give drivers $5 for every "thank you" they receive from customers in the U.S. through their Alexa-enabled device or Alexa app. The promo will cover two-million “thank yous” and will give out $10-million to delivery drivers during the holidays. Customers can only thank their most recent driver and have 14 days after their delivery to do so. Drivers can be thanked multiple times, but they’ll only get one $5 tip per delivery.