I was not able to find any dairy-free sour creams that were not UPF. I have the UPF ones that I found listed below, so you can see what is in them if you are interested.
Green Valley has a lactose free sour cream that is not UPF, but it does contain dairy.
If you are looking to avoid both dairy and UPF, you will likely have to make your own sour cream alternative. You can try experimenting with blending some soaked cashews with water, salt, and a small amount of lemon juice. Hopefully you will be able to find a variation of this to your liking.
My post for UPF-free sour cream is here.
Dairy-free sour creams that are an ultra-processed food:
Forager Project Dairy-Free Sour Cream Alternative
Ingredients: Coconut & Cashewmilk (Filtered Water, Coconut Cream (Organic), Cashews (Organic)), Tapioca Starch (Organic), Guar Gum (Organic), Sea Salt, Distilled Vinegar (Organic), Pectin, Lactic Acid, Agar, Live Active Cultures.
Follow Your Heart Dairy-Free Vegan Sour Cream
Ingredients: Filtered Water, Coconut Cream, Expeller-pressed High-oleic Safflower Oil, Organic Coconut Oil*, Organic Tapioca Maltodextrin*, Less Than 2% of: Tapioca Starch, Pectin, Natural Flavors (Plant Sources), Glucono Delta Lactone (Plant Source), Gellan Gum, Organic Lemon Juice Concentrate*, Calcium Phosphate, Locust Bean Gum, Lactic Acid (Plant Source), Calcium Lactate (Plant Source), Guar Gum, Sea Salt, Sodium Alginate.
Kite Hill Almond and Coconut Milk Sour Cream
Almond Milk (Water, Almonds), Coconut Oil, Rice Starch, Coconut Milk, Maltodextrin, Chickpea Protein, Salt, Cultures.
Only Plant Based Vegan Sour Cream
Ingredients: Water, Rapeseed Oil (30%), Modified Waxy Maize Starch, White Wine Vinegar, Lemon Concentrate, Sugar, Stabilizer: Xanthan Gum, Preservative: Potassium Sorbate, Salt, Sour Cream Flavoring, Color: Carotene, Antioxidant: Calcium Disodium EDTA
Simple Truth Plant Based Dairy-Free Sour Cream Alternative (Kroger)
Ingredients: Prepared Butter Beans and Oats (Water, Butter Beans, Oats), Coconut Oil, Natural Flavor, Gum Arabic, Konjac Root Powder, Calcium Citrate, Sea Salt, Lactic and Citric Acid.
Tofutti Milk Free Better than Sour Cream
Ingredients: Water, Expeller Processed Natural Oil Blend (Soybean, Palm Fruit and Olive), Maltodextrin, Soy Protein, Tofu, Non Dairy Lactic Acid, Organic Sugar, Blend of Natural Gums (Locust Bean, Guar, Cellulose, Xantham and Carrageenan), Veg, Mono and Diglycerides, Salt.
Violife 100% Vegan Just Like Sour Cream Sour Cream Alternative
Ingredients: Filtered Water, Coconut Oil, Food Starch-Modified (Potato, Tapioca), Salt (Sea Salt), Citrus Fibers, Glucono Delta-Lactone, Lactic Acid, Dextrose, Dried Banana Powder, Flavor (Vegan Sources), Olive Extract, Beta Carotene S Color), Vitamin B12.
Wayfare Plant Based Dairy-Free Sour Cream
Ingredients: Wayfare Dairy Free Base (Water, Organic Butter Beans, Organic Oats), Organic Coconut Oil, Organic Gum Arabic, Cultured Dextrose, Calcium Citrate, Sea Salt, Organic Konjac Root Powder, Citric and Lactic Acid, Vitamin E.
Wild Creamery Sour Cream Alternative Cultured and Plant Based:
Ingredients: water, organic sunflower oil, organic coconut oil, organic cashews, tapioca flour, contains 2% or less of: organic oats, organic chick peas, sea salt, organic cabbage, organic lactobacillus cultures, cultured dextrose