I would say that a used 2018 ZL1 would be less than $55k. You can buy a new 2018 ZL1 for $15k off window sticker. At least that was the deal about a month ago when I purchased mine.

I bought my 2017 ZL1 in early March of this year for around $52,000. It had very low miles 422 and thought it was a good deal. I had a trade in with my 2016 2SS and got decent money for it. I found my ZL1 on Cars.com about 300 miles from home.