Purchase and Storage
Spell components are purchased in lots of 20 (20 components fit into one container slot). A lot of components is designed for a particular spell level or lower. The cost of a lot is based on the level.
When a wizard casts a spell requiring a general component, remove 1 component from a lot of the appropriate level. Some spells require very specialized components and are not covered by the general spell components. For example, the 3rd level spell Wizard Lock requires a pair of magnets costing no less than $10.