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Six dollars - https://www.homedepot.com/p/resideo-Water-Heater-and-Sump-Pu...

There are a bunch of options at Home Depot, Lowes, and your local hardware store.

You can find this kind of sensor on Aliexpress for a few euros, if the hardware stores near you don't carry them.

Any idea how these leak sensors work? Is it just waiting to potentially be dripped on by a leak? If so, could you just replace the sensor with a gapped circuit that would be bridged by dripping water?

They are usually just two exposed contacts waiting to be bridged by water, yeah.

> The Badring water sensor includes a built-in siren (60dBA at 1m) that can alert you when it senses a leak

https://www.amazon.com/gp/product/B07J9HZ5VN

These have a loud alarm on them and I don't believe they need to be hooked up to the hub to work (just for push notifications).