Genuine OEM HP Color LaserJet 2820 Toners
The Color LaserJet 2820 has two color-toner choices: HP 123A for lighter color printing and HP 122A for more pages between cartridge changes. Both work with the same HP 122A black cartridge, so the choice is about color capacity, not a different black toner.
Toner Buzz carries genuine HP 122A and 123A individual cartridges and four-color sets. The mixed 122A/123A set pairs 122A black with 123A colors; the all-122A set uses the larger color cartridges. The Q3964A imaging drum is a separate supply, not part of either toner set.