Any experience with replacement toner cartridges for laser printers?

I have a a Dell B1265DFW multifunction monochrome Laser printer, which needs a cartridge replacement. Dell replacement costs 80 euro. Third party replacement compatible with this printer is around 40 euros but not sure if the print quality would be good. Need is for home printing, for school going kids.

Does anybody have expereince with replacement cartridges for laser printers?

-Is there a possibility to refill the cartridge myself ? Any idea where to get such a self refill kit (aoudad Brussels)?
-or is there a printer ink shop in/around Brussels who would refill by empty cartridge for me?
-Or should I try with III party replacement cartridge or simply go for OEM cartridge?