It is really expensive if you buy wild game, however if you actually go out and fish/hunt a couple times a month its a lot cheaper than buying normal food from the store, I mean really you don't even need a boat to fish, and there's lakes every couple miles up here so it costs almost noting to go catch fish. When hunting seasons are around it only takes a kill or two to fill the freezer up that will last a couple months. Also growing your own vegetables is pretty cheap too, if you live somewhere with long winters grow a lot more than necessary then freeze excess to use during winter.
It is basically a lifestyle change but worth it IMO. Getting used to getting food this way and providing for you and your own will also be drastically helpful after the apocolypse