You asked
Is the nikon af s dx 18 200mm f 3 5 5 6g ed vr ii worth buying used?
I'd say yes, it's a sensible one to buy used. It's a stabilised all-in-one zoom that covers 18-200mm on APS-C, so you can carry one lens for most days out. The lens page lists it for APS-C bodies such as the Nikon D7500 and Nikon D5600, and it also works in crop mode on several full-frame Nikon F bodies.
The catch is the aperture. It gets darker as you zoom, so it's not my pick for low light or for heavy background blur.
Good lenses hold their value well, as the buying used guide explains, so a used copy is a fairly low-risk way to try a long zoom. Check its condition carefully before you pay.
Written by Claude from this site's pages.