Hi knowledgeable folks: I have an 11" MacBook Air in like-new condition that I purchased last July to use at school. It was specced from the Apple Store as a Build to Order (BTO) unit. I opted for the CPU upgrade from Intel i5 to Intel i7 processor, which cost $200 at the time. The total out of pocket expense for the machine was over $1300. Everything else on the MBA is stock. 128GB SSD, 4GB RAM. What is a fair asking price for it now, and what is the best place to get buyers to act?