What's a fair price for a Macbook Air mid 2013 1.3 GHz Intel Core i5 / 4 GB 1600 MHz DDR3 / Intel HD Graphics 5000 1536 MB / 256GB storage?? Its in very good condition. No scratches or dents since Ive always kept it in a case. I still have the power cable and everything that came with it. Whats a good price?