Yes.. you can buy extra refills... but any artist needs more than one color inked pen. Three pens is a great deal. You can give them as presents .. or use them all at the same time inked with different colors. ;-)
andrew.bBoth you @Cyber6 are spot on with each point. I'm actually interested in buying only one body so I can practice my Chinese calligraphy from when I lived in China... being left-handed did not go over well with my instructor.