The Hourglass
Cain's shop of mystic wares-- and where he provides his psychic services-- is called The Hourglass. It is a small hole-in-the-wall located deep within The Business District.
With a large catalog of inventory coming from a wide array of ethical sources, he has quite a lot to offer. Whether or not everything in his stock actually works as intended (or at all), however, is a bit of a mystery; most of the time, the only way to find out the efficacy of an item from The Hourglass is to purchase and try it.
As for the offered psychic services, most are walk-in welcome-- with the hard exception of Mediumship.