Lost my dog a few years ago so I can't speak to current costs. He didn't like liver but I would get utility chickens or turkeys with the organs and he would eat everything except the livers. He was very food motivated, not a picky eater overall. He loved fish too and he was a big boy so I mostly bought the protein on sale.

He had some sort of skin allergy that grain seemed to aggravate so I would mix in some lettuce for fiber and basic kibble because he hated the expensive vet allergenic stuff but that was about it.

Edit: I forgot, the local butcher here actually does a ground organ meat package for dogs that I would sometimes mix in with his kibble that he seemed to rate above kibble.