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Hi Lonela, thanks for your question. I'm happy to help.
Any of the toners on this page are suitable for the HP LaserJet M712 printer (the difference in price being due to the number of pages they print / what brand they are):
https://www.tonergiant.co.uk/model/HP-LaserJet-Enterprise-M712dn-toner-cartridges/
The only model I can find in the Lexmark C3300 series is the C3326dw printer, so you'll need to double check what your printer model is to make sure that's correct. If it is the C3326dw, you can find them here:
https://www.tonergiant.co.uk/model/Lexmark-C3326dw-toner-cartridges/
If you need any more help, you can call us on 0345 365 3605 or let me know by replying to this answer.