I saw this thing that ranked the three stores on cost..and a whole bunch of other factors.  You can see the full story here, but this is the general summary of what they found:

• 1. Walmart
  · Lowest prices, generous ad-matching policy
  · Thousands of Supercenters with vast inventory, especially in grocery
  · User-friendly website with myriad offerings and free Site to Store shipping
  · Full selection of services, including photo developing, portrait studio, health clinics, vision centers, and holiday-season layaway
• 2. Target
  · Fashionable clothing and home goods, reputation for quality
  · Modest prices
  · Clean stores with well-organized displays and helpful employees
  · Calm atmosphere that makes for easy shopping
• 3. Kmart
  · Highest prices
  · Limited selection, especially in grocery
  · Disgruntled and unavailable employees
  · Empty shelves and unkempt displays

2 things I wanna say about that:  1) Is anyone surprised?  Of course not. I knew all of this already.  2) How does Kmart still exist?  No offense if you work there, like shopping there, or if they’re a sponsor (especially no offense if they’re a sponsor)