I had a bad experience with buying formula from Amazon. Apparently the boxes are stored in warm conditions because multiple bottles seemed off and the others my baby threw up multiple times. I wouldn’t recommend buying from Amazon
I subscribe at Amazon and Walmart because you get the discount and sometimes they won’t fulfill the order so that’s why I have it at both places to keep a good stock. Never had issues with any of the formula. Also it’s easy to report a problem if you do.
Not formula but I do subscribe and save for a bunch of things for our family; toothpaste, collagen, matcha, baby wipes. I do it for anything I know is going to be a regular purchase. It’s nice to not have to worry about remembering to order something before it runs out and you save some money too.