However if your budget has shrunk lately, as almost everyones has, i have a great solution. take a quick trip to the grocery store, and for under 5$ you can have your very own dry shampoo, and tons of it.
combine in equal parts baby powder and cornstarch, stir, and store.
both act as oil-absorbent agents, while the baby powder neutralizes any odors your hair may have. i store my dry shampoo in an old bare minerals foundation holder that i cleaned up. i love the travel sized connivence. this is a MUST for traveling, comes in very handy at school- gym class /: , and durning the end of a work day.