Do you mean like an electric floatswitches.net type of switch or a Kent style float?
If it's the electric ones I haven't been able to find anything locally but I haven't looked very far. I know Digikey has some in their catalog and apparently Grainger carries them as well but both places carry stuff from companies like Maddison which is $.
I'm going to order some from a buddy in China next week, if you only need one or two I could get you extra.
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