Imp
Criteria from requester: Buyable not foraged
(Side note from Celestia, don't worry! I will never suggest anything you forage for. That's for folks way more experienced in that field. Your princess cares for your safety always. <3)
Imps have a varied history mostly throughout 16th and 17th century Europe. Originally associated with goblins and fae, they later became associated with the familiars of witches and minor demons. The word and main mythos stems from Germany but variations of minor trickster/demonic entities exist in multiple cultures.
I decided to focus on the original 17th century Germanic imps. The word originates from the Old English impa meaning a young shoot. Thus I decided to focus on tea made made from the youngest leaves (white tea) with a little spice for some more demonic elements.
Numi Orange Spice White Tea is a light tea with a small twist of orange peel and lemongrass for citrusy sweetness and cardamom and cinnamon for a good nip of spice. A mild spicy tea for a smaller sort of demon.