When I worked at Wal-Mart, I would also go do nothing in the back while "Checking for something".. Maybe I'd glance at the boxes, but I wouldn't actually LOOK.
Also, if a customer asked me where something is that I haven't heard of, or am not sure about, I told them we don't carry it. Don't ask someone about a product that isn't in their department.. we don't know the whole damn store. Also, if someone tells you they don't carry an item, they're probably bullshitting, and if you then find that item, you're only wasting your own time by finding said employee and telling him that "You found it" in a sarcastic tone of voice. Yes.. I was lying.. what's your point?
Edit: And Wal-Mart employees are busy enough, with 500 customers to serve.. they don't need you asking the price for countless items over the phone. Call Zellers and ask them.. then deduct 10 cents from the price.