I'm looking at a couple different Pro's on craiglist and I was wondering if there is an online guide like KBB for cars that will tell you how much you should pay for a Macbook. I found a couple mid 13 inch 2012's for the $500-$550 range and a 2011 Pro for $400. I actually purchased a 2015 13 inch pro with retina and flash storage but I don't use anything on it besides the internet. So I was going to sell that and get most of my money back and buy a mid 2012/2013 and use that. What exactly should I be looking for when checking out a used mac? Condition, make sure it charges, check the battery cycle for laptops health? Anything else.? What would you pay for a mid 2012 macbook?