Where can I buy replacement ink cartridges?
In the U.S. ink can be purchased at the Livescribe Store at http://store.livescribe.com/.
IMPORTANT: Livescribe 3 ink cartridges cannot be used with wifi/Echo/Pulse smartpens and wifi/Echo/Pulse ink cartridges cannot be used with Livescribe 3 smartpens. They are different sizes.
For Livescribe 3 smartpens, blue and black ink is available in medium point.
For wifi/Echo/Pulse smartpens, blue and black ink is available in medium and fine point. Red is also available in fine point.
Outside of the U.S. please see http://www.livescribe.com/int/smartpen/retailers.html.