1080ti launched in 2017, the 1080 debuted the 10 series in 2016 and the founders launched for $700. I was there Gandalf, I was there 3000 years ago..
MSRP was as follows:
GeForce GTX 1060 (3GB) 08/18/2016 $199
GeForce GTX 1060 (6GB) 07/19/2016 $249
GeForce GTX 1070 06/10/2016 $379
GeForce GTX 1070 Ti 11/02/2017 $449
GeForce GTX 1080 05/27/2016 $599
GeForce GTX 1080 Ti 03/10/2017 $699
Nvidia Titan X 08/02/2016 $1,200
Nvidia Titan Xp 04/06/2017 $1,200
Edit:
Didn't read your previous comment.
For some stupid reason Nvidia charged $100 extra for the GTX 1080 founder's edition (i.e. $699, instead of $599), even though it had the crappy blower fan. However, maybe they did so due to early adopters, and/or those who wanted to buy 2 for SLI?