Hey Ehu,
Remember that one time, about 2 months ago, when you wrote down some unit prices and thought you entered it in inventory? Then you found yourself, 2 months later, wishing you kept that dang piece of paper that had the prices you need....so that you didn't find yourself at work til 7pm, on a Monday night, after already working 10 hours.
Sincerely,
Your tired self.
Damnit.