Exotic Supplies

Exotic supplies is a retailer's term for the ingredients of magic, usually used in places where advertising "magical supplies" would attract unwanted attention (from, as it might be, unmagical people distrusting of magic).

Exotic suppliers in Charmed Life are Mr Larkins in Wolvercote and Mr Baslam in Helm St Mary. Both are slightly shady characters (except Mr Baslam, who is extremely shady), although to be fair a certain amount of shadiness is implied by the covert nature of their trade.