Amazon.com: Okidata C5550 MFP, C6100 Series Black Toner Cartridge (6,000 Yield), Part Number 43324420 : Office Products
Amazon.com: OKI Toner Set for C6100 / C6150 / C5500MFP / MC560 Series Printers. Full Set of 4 High Yield Genuine OKI Toner Cartridges. 43865717 Yellow, 43865718 Magenta, 43865719 Cyan, 43865720 Black.