Of course a sign promoting multiple signs for sales _implies_ a discount! It's just another one of those retailing tricks...like putting the essentials such as milk, butter and bread at the back of the supermarket to make you walk through the whole thing to get them, in the hope that you'll pick up something else you didn't intend to along the way; like playing slow music when there's not many people in to prolong their stay as much as possible and playing fast music to clear them all out when the place is packed...everything in retail is to boost sales (obviously!) and they have many ways of achieving this, mostly without people consciously noticing!