They probably have a minimum-wage clerk in the store to take the orders, and then probably dispatch it through OnForce or the like.

By the way, Walmart's prices are so low, they've dropped the hyphen and capital M from their name.

http://walmartstores.com/FactsNews/NewsRoom/8411.aspx

Do I hear whalesong...?

I guess there are a few "upscale" 'marts around in the Dallas suburbs. One of them is dubbed by the local populace "The Gucci Walmart." I could see Dell going over well with the $60,000 millionaires in these parts.