You asked
Is the sony rx100 worth buying used?
Yes, I think the original Sony RX100 is worth a look used. It's a 2012 model with a 20.2-megapixel 1-inch sensor and a built-in 10-37mm f/1.8-4.9 lens, and buying used is one of the best ways to afford good gear like this. An older body is often most of the camera for much less.
It's an older camera, so check its condition closely. Budget for a new genuine battery, because old batteries lose capacity and that cost can be a real part of the total.
If you want something newer with the same 1-inch idea, compare the RX100 IV (2015), the RX100 V (2016) and the RX100 VI (2018). Each has a 20.1-megapixel 1-inch sensor, so the used price gap between them is the thing to weigh.
Written by Claude from this site's pages.