You can easily refill the toner, but you need a long screwdriver to remove it, which is not easy. Genuine HP toner cartridges seem to have an adjustable lever that makes them easy to pop out. I assume they did this to make copying more difficult. I'm worried about when to replace the toner. If you are interested and want to save money and have enough time to work on cartridge removal, this will probably work.
TEINO Remanufactured Ink Cartridge Replacement for Canon 245XL 246XL PG-245XL CL-246XL PG-243 - Compatible with Canon PIXMA MG2520 MG2920 MG2922 MG2420 MG2522 TS3120 MG3022 MX490 MX492 (1 Black, 1 Tri-Color)
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Cool Toner 055H Compatible Toner Cartridge Replacement for Canon: High-Quality Ink for Your Printer (Black Cyan Magenta Yellow, with Chip, 4-Pack)
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