I'm really sick and tired of people posting blatantly untrue things to mess with people when their entire livelihood is on the line.
Those saying that Costco will not hire former Sam's Club or Walmart employees are lying. Simple as that. I know of at least three people who left our Sam's Club to work for Costco just in the past year.
So if you see an ad for Costco job opening in your area, go for it! Don't let a few internet trolls with nothing better to do ruin your chances at a job.