Fire Ant Farm
Get off my lawn
Not trying to discount the mama heating pad version, but there are also manufactured brooder plates on the market. A bit more expensive, but better prices can be found if you shop around.
https://www.premier1supplies.com/p/heating-plates-and-covers?gclid=CLvRtPTwutQCFQUoaQodFNULIQ
https://www.mypetchicken.com/catalo...er-p847.aspx?gclid=CJbO1Lr9utQCFQuEaQod2dYPGw
Oh, I know. I used to have one. But it's a lot of money to lay out unless you know you'll brood more chicks/ducklings. (Also, I used to have one, a Brinsea, and it got too hot and the chicks hated it. Got rid of it, was worried about burns. Something about needing to be on a different regulated power source that they have in the UK where it's made vs here).