There are currently 3 Teleport Stones in the game.

Teleport Stone Central:

Brings you back to your sleeping chamber. Received from Trey at the sleeping chamber.

Teleport Stone Begus:

Brings you back to the capital of Begus. Received from Elly when finishing her recruitment quest.

Teleport Stone Amagal:

Brings you back to the Yin Tower in Amagal. You receive it after meeting the Magespirit, which follows the thief girl events in Parverhill.