Ordering a 10 pack of Sony Lithium 3V CR2032 batteries for $6 including postage.
That is partial joy.
The real joy occurs when I install the batteries in eight different color coded locater devices.
At the touch of a button, I will be able to find the scissors, the cat, the Glock, and five other easily misplaced items.
Someone gave me this a while back, practically new in the box, and I kept forgetting to order batteries.