Under $100: the first thing that makes the coffee better

This budget buys the brewer for a kitchen that has none, or the tool that fixes the weak point of the one it has: fresh grinding, or weighing instead of guessing.

Budget rule: a pick stays on this page while the price we recorded for it in the last two days is $100 or less. A pick whose price is above $100 is taken off the page, and so is a pick whose every priced seller showed it out of stock when we recorded it.