I'm not sure if Cedar is toxic to bees, but it seems I remember my grandfather telling me way back when that bees never nested in cedar, must've been for a reason. I personally don't know though. Good luck on your search.
Cedar is commonly used for beehives, but many go with pine or other wood due to the lower cost. We use Western Red Cedar for all of our Warre and Top Bar Hives without any issues. I have seen colonies living in cedar trees here in the Portland Metro Area as well.
You should have no issues using cedar for your supers, and they should last a long time!
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