: You can find listings for Mirrors of Kalandra on the official Path of Exile trade site by searching for "Mirror of Kalandra" in the "Bulk Item Exchange" or "Items" section.
Most players "buy" a Mirror using other high-value currency, typically .
: You can buy individual "House of Mirrors" divination cards. Collecting 9 of these cards allows you to exchange them for one Mirror of Kalandra.