If you can go lower, I'd take it at 12k+shipping, or 7k+you can have my old PW3 (the kindle's in great condition with unapplied new screenguard but you might want to buy a new cover; I didn't buy the most durable cover and I've probably used it over 2000 hours).
Just a student, so I can't exactly afford premium ereaders yet. So yeah, no worries if you sell it off for more - I'll just get something later with a type-C port instead.