I did this comparison for someone and thought I would share. The products selected are based on the mama's individual needs. I do not endorse or get paid for anything or crap like that.
Let's compare the Bio Salud drink available at Walmart to the Lifeway Probug drink that's a little harder to find but becoming available at places such as Target.
The Bio Salud drink: "Filtered Water, High Fructose Corn Syrup, Cultured Grade A Pasteurized Nonfat Milk, Sugar, Dextrose, Natural & Artificial Flavors, Potassium Sorbate (to Maintain Freshness), Aspartame*, Vitamin A Palmitate, Vitamin D3, Contains Viable Lactobacillus Bulgaricus, Streptococcus Thermophilus, Lactobacillus Acidophilus, Lactobacillus Casei And Bifidus Yogurt Cultures. *Phenylketonurics: Contains Phenylalanine. Contains: Milk."
Remember that the ingredients are listed by most to least in a product. You get water, HFCS, processed milk, more sugar, more sugar, flavoring (chemicals), preservative, fake sugar (neurotoxic), fake vitamin A, vitamin D3, and 5 strains.
Now let's look at the pro bug drink. I randomly chose the Sublime Slime flavor:
"Organic Grade A Pasteurized Cultured Milk, Organic Cane Juice, Organic Lemon/Lime Juice Concentrate with 12 probiotic strains."
Now, admittedly, the Bio Salud drinks are pretty cheap. I think they run $1 for a 4pack over here. Meanwhile, the Probug drink runs $1 a pouch. (Squeezy pouches for kids.) That being said, Lifeway Kefir has other products not marketed directly to children but still pretty tasty and cheaper. A 32 oz bottle of Lifeway Kefir is $3-4 for example. So the price difference is there but not prohibitively so for such a difference in quality.
Also important to note: a product like this is more likely to be consumed daily by children and it's dairy. So those are two big factors for ensuring you buy higher quality. When you're making changes to your diet and you're on a budget, choose the switches that will make the biggest difference. Go for high quality animal products and switch out the items you use the most. Don't be fooled by packaging that advertises health benefits; go straight to the ingredients.