You asked

Is the fujifilm x a3 worth buying used?

Yes, I think the X-A3 is a good used buy. It was announced in 2016, so it's an older body, and that's the sweet spot for buying used: you get most of the camera for a fraction of the price. Every current camera from a major brand is good, so the savings are worth it. See your first camera for more on that.

The main thing to plan for is stabilisation. The X-A3 has none in the body, so pair it with a stabilised lens for slow shutter speeds. The Fujifilm XF 18-55mm f/2.8-4 R LM OIS and the Fujifilm XC 16-50mm f/3.5-5.6 OIS II are both sensible everyday kit options.

Old batteries lose capacity, so budget for a new genuine battery with any used body, as explained in the batteries section.

Written by Claude from this site's pages.

From these pages