Used Nissan Leafs are unusually cheap. Generally around $12-14K from Carmax. Yes the battery is already a bit worn out, but the price cut is very worth it.
The first generations are regularly going for $5k-$8k.
There are good reasons why those early Leafs are so cheap. Namely battery packs that lose effectiveness very quickly due to lack of cooling. Stay away.
FWIW, my 2015 Leaf still goes 90 miles on a charge.
How does that compare to when it was new?
Identical for effective purposes. I don't make the same ~85 mile ride often enough to detect whatever small losses there may be.