In MY situation, Just-In-Time inventory management works out fine. Even on the very rare occasion that PP 5w-20 does not have a $10 rebate, it still is only about $22 at Meijer or Wallyworld. A person living in the boonies operates differently. I understand some people derive enjoyment from these fiscal and time management activities. Good for them, but not for me (I enjoy maintaining my own stuff, but I'm not going to invest energy on the logistics). Even at my workplace I maintain a very small inventory for top-ups, etc..