I've tried many cheap remanufactured replacement cartridges and have often encountered problems (leaking cartridge, bad ink, etc.). HP's cost a fortune but they work better so I pay for them.
Brother TN436BK Super High Yield Toner, Black - Retail Packaging
11 Review
Get Quality Prints with HP 78A/CE278D Toner-Cartridges for LaserJet Pro M1536 and MFP P1606
11 Review
HP 902XL Magenta Ink Cartridge for π¨οΈ HP OfficeJet 6900 & Pro 6900 Series, T6M06AN
11 Review
HP 62XL Tri-color High-yield Ink, Compatible with HP ENVY 5540, 5640, 5660, 7640 Series, HP OfficeJet 5740, 8040 Series, HP OfficeJet Mobile 200, 250 Series, Instant Ink Eligible, C2P07AN
12 Review