I buy chicken backs by the 40# case, which is the bulk of their diet. I then supplement with beef heart, kidney, liver and egg. When salmon are cheap, I buy whole fish for them. They get everything whole, so bones and all. Oh, and they love sardines packed in water.
For snacks, I have a freezer of venison carcass and lamb neck. For me, I buy meat at the grocery store that is marked down, we get a couple bucks off when it's got 2 days or less on the expiry date.
Some things to be cautious about; salmon must be frozen for 24 hours before feeding for risk of worms (forget the type). Pork should be frozen (deep freeze) for 30 days to kill any potential parasites (forget this type too
).
My vet did express concerns over dogs licking kids after eating for bacterial contamination.
I wouldn't buy the premade stuff since I don't know what goes in it, and it's more than double what my cost is now. For average consumer, it might be about the same cost as store bought meat.