what is the cost of setting up a booth outside of walmart for one day

call and see

I am not sure but it should not be a lot just ask the the management ok

It depends on what you're selling I would ask management first

Typically if you can provide a non-profit business ID number they will allow you to do it for free. Make sure you talk to the manager a few weeks in advance.

I don't think it cost for non profit stuff. Just advanced planning and coordination with management.