Primal Pet Food Frequent Purchase Program - Buy 12 get 1 Free. The program includes most Frozen Raw Formulas, all Freeze-Dried Formulas, all sizes of Goat's Milk, and Six Packs of Raw Marrow Bones. Mixes and Grinds are Excluded. Items are categorized according to Weight, Species, and Type. Mixing and matching formulas is encouraged, Same Size, Same Species, Same Type, Least Value Purchased Free. All purchases must be made at the same retail store or chain.