Unused, brand new automatic kitty litter system with safety features and motion sensing to automatically clean the litter and drop it into a separate compartment for easy emptying.
We bought this nifty box new for $200. Our friend has the same box, and their cat loves it (which is why I got it). Unfortunately, our cat did not (my fault). The box is made for normal-sized cats, and ours is a larger breed (20+ lbs), so it has been sitting in a corner until now—never used.
It even can connect to an app for usage, litter levels, etc. but again we never got to that point.