Is the sony a9 worth buying used?

Here is what the site says about that.

From Sony a9: Sony a9: A mirrorless camera by Sony with a 24.2-megapixel full frame sensor, announced in 2017. A stacked-sensor sports camera, now a used bargain for fast action. Specs - Maker: Sony - Mount: Sony E - Sensor: Full frame, 36 x 24mm, crop factor 1.0 - Resolution: 24.2 megapixels - Stabilisation: in the body - Announced: 2017 - Type: mirrorless camera Focal lengths on it Full frame is the reference size: lenses ...

From Buying used: Buying used: Cameras and lenses are built to last, and many photographers upgrade often. That makes the used market one of the best ways to afford good gear. A body that's one or two generations old is often most of the camera for a fraction of the price.

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