I recently purchased a 2018 720s from out of state which came with only one key. Initially my local mclaren dealer quoted $800 for a spare key, which I was willing to pay, then he said they don't sell single spares, and I would need to purchase a set of spares (two) for $2400, which sounded like a serious shake down...does anyone have any experience with this? Can you point me in the right direction? Thanks