Which ink/toner does the HP LaserJet 1020 use?

The HP LaserJet 1020 (laser, 2005) uses Q2612A.

Compatible cartridges

CartridgeColorYieldPagesOEM priceCost/page
Q2612A black standard2000 $75.00 3.8¢ OEM · AmazonCompatible

XL/high-yield cartridges usually cost more upfront but lower the cost-per-page — better if you print often.