Brilliant... As I said and as I guessed, the range you've quoted is the PGI-525/CLI-526 range that is around 5 or 6 years old. It's like me saying I can buy a Corsa cheaper than a Merc...
eBay item number: 191711793099 4 sets for £6.79 delivered Compatibles Yes and chipped, but so is this 'deal'.
I doubt you can get 4 full sets on this range under a tenner... Maybe 1 set of cheap compatibles.
Far cheaper on ebay, as stated by VimesUK you can get 4 full sets of these for under an tenner. Not had any issues with fading either.
To dissuade your from using non canon ink they have things like birthday cards and colouring sheets etc that you can print but only with their ink apparently. My guess is most people don’t know or care about this feature but it demonstrates how good these fakes are! Hope that helps, happy colouring