Daddio,
It is true that Wal-Mart stores and Sam's Club's are divisions of the same company. (Wal-Mart Inc., which also operates many other divisions of retail outlets) However, it is not true that it's all the same product. The buyer that buys a food saver for Wal-Mart is not the same buyer that buys the food saver for Sam's. The same is true with socks, radio's, ring's... what ever. Each buyer has margin goals that he/she must hit. In some cases the Sam's buyer may be able to afford to pay for more quality in a certain item where the Wal-Mart buyer could not. Unfortunately for us, it's not always the case. Sometimes, it may be the same item. Sometimes, the Wal-Mart buyer may be able to afford more quality. Just like comparing Wal-Mart to Target or Sears or where ever, you can't always determine the best value. Thanks to great forums like this one, you can often do some research and get first hand knowledge from end users and make your decision that way. I don't have any comments on the food saver I just wanted to chime in on the differences (or similarities) between Wal-Mart and Sam's.
Good luck with your search for a good food saver.