Other Models of 3900 Series:
3900, 3912, 3916, 3930

You may consider buying IBM 3935 Remanufactured Toner Cartridges. Remanufactured cartridges are used cartridges that have worn out parts replaced with new ones. They provide same level of quility as new toner cartridges, but for lower price. Using remanufactured cartridges saves energy and raw materials that would otherwise be consumed by production of new cartridges.