I was a bit perplexed to find out that Discover doesn't even issue their own card - the Sam's Club card. It turns out the GE Money is who issues it even though it has the Discover emblem on it. I suppose that means they must use Discover's payment processing networks only?
O.T. As you may remember a few months back GE Money was begging for someone to buy their store credit card division. It seems like Sam's Club would be a gem to have but apparently not.