You can cut the cost of commercial raw about by 30-50% by feeding a base mix (like The Honest Kitchen or Sojo's) that contains no meat. It's a porridge that when rehydrated supplements meat of your choice to make a complete, balanced (AAFCO compliant) meal. Sojo's grain-based Mix-A-Meal is far and away the cheapest base-mix -- it comes in a huge 40# bag. If your dog handles grain well, that would be the cheapest way to still feed a partial raw, balanced diet.
The Honest Kitchen's Preference is a grain-free option, though significantly more expensive than Sojo's. I go through two boxes a month with a 75-ish pound adult dog -- plus his meat (which turns out to be 10# week). Dr. Harvey's Veg-to-Bowl is comparable to THK, and their Paradigm formula is excellent (but very expensive).
FWIW, I buy my THK through OnlyNaturalPet.com and can always find a coupon code for at least 15% off.
I would also add fish oil -- and taurine, as there's some concern about that with these diets right now (discussed in another thread).