Use the code TNR2X7N15 to receive 10% off your toner order at TONERSTORE.COM. I'm not aware of the expiration date, it worked on 12/27/2008. I have ordered from this place before and they have the best price on remanufactured toner cartridges for my HP 4200 printer. They work as good as original HP cartridges (12,000 copies on my last one) and are cheaper than refilling yourself. Check around for prices on your particular printer, I did find a lower price elsewhere on my HP 4250 cartridge (GO4SUPPLY.COM).