I've been using Canon printers for years and it would never even occur to me to buy 'original' inks. Decent quality third-party ones are just as good. I always buy from here:
https://www.inkredible.co.uk/canon-pixma-mg6350-ink-cartridges-2
The thing that you should never skimp on though is printing paper, which is
far more important than the brand of ink that you use. I use good quality 'bright white' 90gsm inkjet paper for my letters, etc, HP Everyday Photo Paper for most of my photos and something like Kodak Ultra Premium photo paper for prints that I might want to frame as gifts, etc. Far too many people blame poor print quality on the inks they're using, when they should be using better paper to print on!