Thanks for the heads-up! My wife is currently trying one out, and might want to buy it, so that's a decent deal--plus, there's the added benefit of Costco's return policy.
We stopped by a Samsung Studio kiosk at a nearby mall, and they actually have a 21 day test-drive offer for the Tab S, where you can bring it home and try it for free! With a credit card deposit, of course. They kiosk doesn't actually sell them--we have to return it by day 21, and then buy it somewhere else if we like it. But an added perk is that if we do buy it, we can bring the receipt back to the kiosk, and they'll give a $50 Google Play certificate. Not bad!