Ditto what AB said.
Some dogs do OK with a mixed raw & kibble diet (there are some here who do it successfully), but it is much harder to tell how well-balanced the diet is, and if there's ever an issue with allergies or 'runny butt' - you will have a harder time figuring out what the cause is.
The best, most affordable raw diet, would be to make friends with hunters... help them clean old food out of the freezer, and take all the "parts" of their animals when they cut them up.
You want a diet that's 80% muscle meat, 10% bone (wrapped in some of that muscle meat), 5% liver, and 5% "other organs" (kidney, pancreas, spleen, brain, etc.). That's what we aim for, anyway - it's the "Whole Prey Model Raw" basis if you want to google it.