I find that different grocery stores carry different products.
I shop at several, depending on what I'm looking for, ranging from regular supermarkets to places like Whole Foods. And of course, many are pushing "house" brands.
I can't figure out the obsession with altering products. I wrote a company once a long time ago, explaining that I go into a store, pass by hundreds of other soaps, so I can get this particular soap. "Why on earth would you change it? Then there's no reason to pick your brand, is there? Do you think I have loyalty to a particular company? If somebody else makes what I want, I'm there, man."
You can find spare parts for almost any car if you look hard enough. Tell me his car model and year (specific as possible) and I'll look.