I'm looking at Tar Drives and the like, but preferably I would be able to swap my current 256gb hard drive for a 1tb sized drive. However, I read somewhere, I believe the Wirecutter, that it's not possible with late-2013 MBPr to do an aftermarket hard drive upgrade. How much would it cost to go through Apple to get my hard drive size increased to 1tb? Or what about eBay? I'm seeing prices in the $600-$700 range for 1tb, but buying a hard drive from eBay makes me nervous.