Link:
https://www.amazon.com/Amazon-JK29LP-Glad-Dash-Button/dp/B0155NGW12/
Edit: Glad button back up to $4.99.
Tide Dash button is $.99 for one day:
https://www.amazon.com/dp/B0187TMRYM
Edit: Tide Dash button sale is over
IAMS button is $.99: https://www.amazon.com/Amazon-JK29LP-Iams-Dash-Button/dp/B01N3Z49V2/
Today, the Tide button is $0.99. Last time they sold a bunch of different buttons for $0.99, I bought 10 different ones. I still got the $4.99 credit on my first purchase for each button. Some of them didn't have anything worth buying, even with the $4.99 off.
I still haven't done any projects with them, but I gave 5 of them to my nephew. One of his projects is a button that his mom pushes to text everyone in their family that dinner is ready.
Like, is the idea for you to have some drawer in your house/apartment/whatever just chock full of these things for every conceivable product?