I am interested in the 1080ti if you adjust your price.
On ebay they are bein sold Used with Box and Waranty 1year+ for 600. And you get a lot of less after ebay fees.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.de%2Fulk%2Fitm%2F292590222718