They do have that filter but annoyingly it resets between each search. I don't buy a ton from Walmart but I typically buy allergy medicine there since it's cheap. So I go to walmart.com, search for "allergy medicine", scroll through the filters and then click Retailer->Walmart and then pick my poison. Then I realize I need to add a few bucks worth of stuff to hit the free shipping threshold so I search for "dark chocolate" and add something to my cart...only to realize it wasn't directly from Walmart so it doesn't apply. For every search you have to go in and filter by Retailer->Walmart specifically. Ugh.