[locals] does anyone know where I might find American toad eggs or tadpoles?

I'm hoping to add some American toad eggs/tadpoles to our pond/yard so that they eventually help with eating slugs, but as far as I can tell they aren't in our town at all. I suspect that it's because people use pesticides on their lawns...

I realize that adding them may be sad for them if they decide to relocate, but I want to have at least tried, you know?