My cat is on raw. He is free fed so I have no clue how much he eats lol. But I am trying to put weight on him so I am more than happy to let him eat however much he wants.
I could never afford to feed exclusively canned. It would cost like, $100 a month to feed him!
We just started raw a couple weeks ago so I don't know what the monthly average will be, but it's definitely a lot cheaper than that lol. We get ground mixes and our first purchase was 11lbs of meat (few different proteins), and it was a grand total of about $40 - and in the few weeks he's been on it, he's hardly put a dent in the supply, so that'll last a while.
He was never really on a good brand of kibble. Best he got was California Natural but he was only on that for 2 years. Otherwise most of his life has been spent on either Iams or prescription diets. When I would supplement with wet food, we would do a variety - Weruva, BFF, Before Grain, Natures Variety Instinct, Taste of the Wild, basically any somewhat-reasonably-priced grain free foods. And he's always been free fed... lol so I don't even know what a "normal" amount is