So I went to Costco to buy my wife and her mom new cell phones from the cell kiosk they have in the store. We did some shopping around on the internet and the Verizon store and found that Costco had the best deal. So we bought 2 phones for $10 each for $20 and the sales tax ended up being $18. I am not sure if they screwed up or for some reason its state law to tax on the before proce and not the promotional price? Someone learn me or did they screw up?