no Amazon= Simplicity for the customer
if you had a choice Walmart and Amazon
and Amazon was even $.50 more
who are you buying it from?
Not always, if it's a larger item sometimes I find it easier to return to walmart in person then to pack and shlep something to a ups drop off. If it's a small thing that can fit into a ups drop box that is the best.
Plus, walmart has ebates, amazon does not (most categories anyway)