You can get Fresh Digest at Petco. Prozyme you can order from Drs Foster and Smith online. Both are probiotics. The size sold at Petco is about 100 servings.
Overall Eco-Friendly Pet Food Ratings
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Interesting pet food rating chart from Greenopia, "Experts on Green Living." Ranking criteria based on 1) ingredient and environmental reporting, 2) quality of ingredients, 3) animal testing 4) eco-friendliness of packaging 5) supply chain (how the products are transported and whether locally or internationally-sourced ingredients are used), and 6) green building design at the company.
"It is worth noting that, as a whole, the pet food industry has very poor environmental reporting. Thus we could not assign weights based off the product's life cycle impacts (there was not enough data), but instead focused on the product itself and considered the impacts from the rest of the life cycle as supplementary information."