That is not true. If that was true Wal Mart Inc, would be under a lawsuit for the FTC about unfair marketing and trade practices. The "W" dosent mean a thing. Model ### vary by store & SKU's. The laptop is the same exact thing. Also the reason being Sam Club is cheaper, is because you pay for membership, they also use your personal information to sell to 3rd parties to also generate money. And the reason Wal Mart is so much cheaper is because they buy more of 1 item than any other retailer, because they do that, they get cheaper bulk prices. Wal Mart has over 5,000 stores, they pass their savings down to you. And Office Depot has the same exact product being sold for more then Wal Mart sells, Why? they only operate 900 stores. They buy less, they save less, the more money they spend on items, the more you spend.
Also the reason I know the SKU and model ## vary by store is because each different store might have "conflicts" with already exsisting SKU. Also the Item number/callsign might be too long or too short. I used to work at CVS and I did the Item Management on the computer. Also dont forget maybe the "W" was the item callsign to begin with.