uCsDNerd, you hit on one of the possible consequences in calling, they don't bother actually looking up the price. The second consequence is you alert them to the the deal, they tell you "Nope, none in stock." and move the item to the back room so they can buy it later at their discount. (I would too if I worked there)
So you roll the dice on B&M deals, gotta spend the gas to get lucky sometimes. You never know what they will clearance, and you might find a better deal on something while you are there.