Sportsmans Warehouse started a sale today but they don't have stock

Sportsmans warehouse started a sale today. I visited their website this morning and saw the HS Fitness home gym for sale. It was out of stock online. I subsequently called many stores in Gauteng and they confirmed that it's out of stock. I asked whether I could order it at the sales price and one of the salesman said that the sale is ending on 18th January and stock is only coming in towards end January so I can't get it at the sales price. What's the point of promoting an item that is sold out from the start?