Find the cheapest bulk products on Amazon. From diapers to Nerf darts to Pop-tarts.
You know the price today. But what was the price yesterday? Or the day before that?
K-cups are just okay, but they are still worthy of their own price tracking website.
Never run out of batteries. And now, never overpay for them either.
This is a new version of UnitPrice.org, even if it looks the same.