The 2012 MacBook Pro 13-inch has an upgradeable SATA hard drive

The 2012 MacBook Pro 13-inch was the last of a breed — it still has a standard 2.5-inch SATA III bay you can open up and swap without proprietary tools or adapters. Drop in any SATA SSD and it transforms the machine. These things are collector-worthy partly because you can still actually upgrade them.