I forgot what I paid for mine, but when I bought my Z new in 2017, they came at me with that 4 year warranty (after the 1 year manufacturer expires) with some ridiculous number. I said no, and they immediately dropped the price down to something that was more reasonable. I tend to think it's about $200/year, so maybe I paid around $800 for it? Again, I don't recall for sure, but that feels close. May have been closer to $1k.