One checklist item you did this week, and what it cost

Now. The board has been quiet, and I'd like it to stay useful rather than just tidy.
So here is a small request. Post one checklist item you actually did this week, and what it cost you. Money, time, or just an awkward phone call to someone you should have rung. Any of those counts.
Mine goes first, as it already does: item 147, the shutoff valve. It cost me one wrench, a Saturday morning, and a cup of coffee I didn't drink until it was cold. Worth it.
Keep it short. A line is plenty. Nobody needs to write an essay about their pantry.
If you haven't got an item done yet, pick the smallest one on the list and do that. Item 1 is always a fair place to start.