I used an Apple flip case for my last phone. It was perfect because it can cover the camera and also gives me a place to keep my office key card, ID etc when I don't want to carry my whole wallet around. Unfortunately, Apple doesn't make it anymore, but it's a worthy replacement and the price is much lower. But I don't think it's an RFID blocker because my card key is simply scanned from the inside of the case.
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