I`m willing to buy up to 12 1080ti gpus (EVGA/MSI/Zotac/Asus).
post your offer please.
Where are you located?
It's probably cheapest and easiest to just buy them new.
It might be easier to buy them new but its usually cheaper to buy them used, all assuming that the card is still in good condition.
not that easy for used. as most are not selling their 1080ti's
and most new are selling at a premium