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£14.60 inc. VAT
AI-generated summary
The Canon CLI-42GY grey ink is priced pretty competitively for a genuine Canon cartridge at £12.14 ex-VAT, which makes it a sensible option if you’re printing a lot of jobbing documents and need consistent greys for charts, diagrams, or “proper” brand-coloured internal comms. In day-to-day office use, genuine cartridges tend to behave more predictably—fewer weird streaking issues and less faffing with printhead cleaning cycles—so your printer stays reliable rather than becoming a minor maintenance project.
That said, I’d only buy it if your printer is actually designed to use this exact cartridge and you print often enough that you’ll get through it before it starts to sit around. If you’re printing sporadically, the cost savings of a cheaper compatible option (when offered for your model) can outweigh the risk—though with ink/toner the “too good to be true” ones are where quality tends to slip. If you want reliability for an office that “just needs it to work,” get the Canon; if you can tolerate the occasional print inconsistency to save money, then it’s not the best value.

Canon
Canon PFI-5100 PM - 14.4 ml - photo magenta - original - hanging box - ink tank - for imagePROGRAF PRO-310

Canon
Canon CL-511 - 2972B001 - 1 x Cyan,1 x Magenta,1 x Yellow - Ink Cartridge - For PIXMA MP230,MP237,MP252,MP258,MP272,MP280,MP282,MP495,MP499,MX360,MX410,MX420

Xerox
Everyday - High capacity - magenta - compatible - box - toner cartridge (alternative for: HP 219X, HP W2193X)

Canon
Canon CLI-42 BK/GY/LG/C/M/Y/PC/PM Multipack - 8-pack - grey, yellow, cyan, magenta, light grey, photo cyan, photo magenta - original - ink tank - for PIXMA PRO-100, PRO-100S, PIXUS PRO-100