I nearly always find it cheaper to cook from scratch. Especially mead based dishes, I generally cook maybe three helpings worth, one goes in the freezer, one in the fridge for a couple of days time and one goes on the dinner table straight away.
I used to make my own bread too, buying good quality flour (which, much to my surprise did taste better than the cheap stuff) meant I didn't save a vast amount of money per loaf, last time I worked it out it would have been less than 70p, but all prices have risen since then.
As for pizza's - I gave up on them, not for the cost but for the time they take, if I want to spend that long cooking (and often I do) then there are many other things I would prefer, but that is just because I am not particularly keen on pizza.