I have a used Nikon D40x I'm unsure how much to sell it for?

I have a D40x which is used, I do not have the box for it or instructions, only charger and battery and the lens it came with, I'm unsure of how much to sell it for. It is in very good condition and I have only taken 6, 000 photos with it.

Take a look at completed ebay listsings, that should give ou an idea where to start.

Ballpark is probably £150-£210. Given the information you have, I would imagine that you're going to sell it for around £170, as you're missing bits an pieces which regardless of how careful you've been with the camera will depreciate it.