That's a good price and these Minis are about the best overall value in the guilele market right now even new.
Did you measure the nut yourself? I only ask as I've seen some sources that said the electric models like this had a narrower nut, like 48mm, than the standard models. FWIW, string-to-string spacing on my Mini M is right at 1-2/3" with nut width just under 2", I.e. 50mm as advertised.