No, they aren't really common. Just look at rings. You've only got a 4% chance of getting a ring, then a 15% chance of having it a protection ring, then a 15% chance of getting anything better than a +2*. The chances are extremely small. Bracers aren't any better (2%, then 19% of that 2%, then 20% of that to get anything decent). And then you have to convince the rest of the party that you should get all of these.
Meanwhile, the cleric is rocking plate and shield quickly that doesn't need to be magical at all.
* out of 1000 random magic items, 40 are rings. 6 are protection rings. Only 1 is +3 or better. 1 out of 1000 isn't exactly what I'd call common.