When my printer ran low on toner, HP's software let me know it was time to replace my cartridge and gave me the option of ordering it direct from them.
What a convenience, no need to try to find the correct cartridge, because the printer tells them and the shipping was very speedy!
This is a replacement cartridge and it has always worked well for me. Actually I am now winding down on my prior filter, so I have not as yet put it in my printer.