http://www.circuitcity.com/closed.html
For those comparing prices to "costco and sams club"... the products are NOT the same in about ever case when it comes to electronics. Costco and Sams will have the same "type" of tv and lead you to believe its the same but it IS NOT. If you check the exact model #'s, call the company supervisors like sharp etc... you will learn. The models of tv's are either specifically built for those places with cheaper parts and less features or are discontinued models. I've proven this point about 20 times already with different ones who purchased the "same" products at a cheaper rate via sams or costco. I'm not saying not to buy anything from costco and sams because they do have a great return policy but I am saying that your silly to compare the prices for the most part.
Some models numbers are changed specifically to appease certain certain retailers to make it confusing to comparison shop. This is common with mattresses. You often can't price match a mattress between stores because the specific model number is only sold at one retailer.
There may be "some" models or whole lines of equipment that are specifically made for warehouse clubs like the Vizio flat screens, but alot of what you posted is bs.
Alot of what Costco and Sams Clubs sells is exactly the same as what is sold at other stores. For instance, Apple does not make iPods with "cheaper parts" for Costco and Sams Club. A Wii or Playstation at Costco has inferior parts inside than a Wii or Playstation at Circuit City? Prove it.
There are items with model numbers changed to identify they were sold to a specific retailer, but your claim that means they have cheaper parts which implies what you buy at Costco is going to break or not last as long as what you buy from Circuit City has nothing to back it up.
The different model numbers are most likely the same obfuscation used by the mattress manufacturers to appease retailers. It gives an out for price matching and also will prevent people from buying a product at one retailer and then trying to get an exchange or refund from a different retailer claiming they lost the receipt.