HP recently switched to "regional" cartridges. Once you put one of these new "regional" cartridges in your device, all of your old cartridges will stop working. HP will not replace your old cartridges or refund partially used cartridges in your device. I would think long and hard about buying an HP product as it could change again.
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
Cartridge NV Print CE285A for HP LaserJet Pro P1102/P1102w/M1132/M1212nf/M1217, black
13 Review
4-Pack Toner Bank Compatible Replacement for Brother TN760 TN-760 TN730 TN-730 Black Toner Cartridge for MFC-L2710DW DCP-L2550DW HL-L2350DW HL-L2390DW MFC-L2750DW HL-L2395DW HL-L2370DW Printer Ink
11 Review