Rear Differential Leaking

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2017 CX-5 GT
2017 CX-5 Grand Touring with 109K bought new has developed a rear diff leak. Thought it was an axle seal but being told it the Diif. I am getting quotes for 3600 +
to put in a used differential with 70K miles on it. Not sure if I should spend that much money for a used part. Is this a common problem for these cars.
 
I agree on the cost. Still drive able but wrestling with spending the money or trade for something newer & slightly used. So other people have had issues with this, I had all the fluids changed at it's regular interval. Disappointed to have issues like this when we took such good care of it since new. I am wondering how common this is for these models.
 
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