Lexmark T640tn toner cartridges and supplies. Guaranteed quality, lowest price and same day shipping! Our compatible cartridges and supplies for Lexmark printers are specially engineered to meet or exceed the print quality of the OEM(Original Equipment Manufacturer) cartridges. Purchasing our Lexmark cartridges is a great way to save money without sacrificing print quality. All our compatible Lexmark cartridges have one year warranty and satisfaction guarantee so you can shop with confidence and save time and money.