If you need only $400 a month, you have a looot of time to spend walking to Walmart.
Some of the middling-old sections only have one sidewalk. The oldest have them on both sides of the street, and the newest developments have them also, usually.
I see from Google maps that here in Illinois the situation seems to be a bit better... (E.g. Morris, Rantoul and even Du Quoin). Du Quoin seems very inexpensive and seems like it would make a better argument than somewhere truly rural (it even has Amtrak service)
I can’t say for sure, but I think this is much more typical of American Walmarts than it is to be able to easily walk to them.
Streetview of your opponent as a pedestrian trying to access the Massena Walmart: https://maps.app.goo.gl/ufTWTHxHCReFP8VA9