There are many different manufacturers of compatible toners. You can find them everywhere, including here. However, I cannot make any further recommendations because I have always bought the original toner, including here. I would like to give the following reason for this. If the compatible toners are 50% cheaper than the originals, then there's a reason for it and I want to enjoy my printer for longer...
To see which toners are compatible, just go to https://www.toppreise.ch/fr and enter the manufacturer's toner reference. But personally, I only use original toners because I've had too many experiences of people I know having problems with generics... It's up to you.