How can I store inkjet cartridges for an extended period of time, when the printer is not in use?

The use of draft printing will extend the life of the cartridge immensely, as this option allows you to print with minimal ink. This also speeds up the printing. Choose this from print options menu. When asked about the quality to be used for printing, select draft quality.
If not printing reguraly, use an inkjet catridge case to keep your catridges into it. This will keep the cartridge from drying out and will keep it free from dust and particles that can clog when it sits too long.
Another tip would be, saving your ink for high quality pages only if you actually need it. If you want great deals on inkjet catridges, visit JTFBUS, world leaders in home and office printers.