There are some things about wal-mart that I don't like, but most other retailers do anyways. But what separates wal-mart from amazon in terms of evil, is that the government is subsidizing Amazon.
Amazon isn't by far the best etailer/retailer, but they are one of the more convenient ones. They are quite expensive when it comes to food items, and their management of whole foods demonstrates they don't quite grasp the grocery market.
About the best wal-mart can do for smaller purchases is ship them to local stores for pick ups. The Wal-mart stores isn't quite that good for vegetarians, and they are often slighting us by cutting back what they inventory in terms of refrigerated items. No more Quorn products, no vegetable eggrolls, all their American cheeses have animal rennet in it. Basically have to shop elsewhere.