These are $15 at the coffee shop on Tate!
Some more funky things about caffeine: we pay more for it per volume than gas, it is a powdery white alkaloid in pure form, Yerba Matte, Guarana, and Kola Nut are other (than the obvious two) natural sources of caffeine. Scientists say "1,3,7 trimethlyx(z)anthine" when they talk about it, it has a half life of 6 hours, it has no physiologically addictive qualities (no brain reward circuits), recommended dose is < 300 mg/day, and overdosing would require taking it by the gram/day.
Youtube: Caffeine! by the scishow