ThinkGeek used to sell them, but that's not much help since I just discovered that TG no longer exists...
I really missed them on April Fool's Day this year. Like what's the point of even honoring the day if I don't get to start it by looking for the fake products in the TG catalog? Maybe I should just go back to bed.
[1] https://www.ebay.com/itm/10cm-Diameter-Focal-Convex-Mirror-L...
[7] https://www.amazon.com/Computer-Rear-View-Personal-Security-...