They do, but it seems to me the point of having a showroom associated with the order counter is to encourage impulse purchase when the customers come in to to place/pickup thier counter orders. With no prices, the impulse is strongly attenuated. With little else to do while your order is being pulled from the warehouse, they have a captive audience…shame to waste it.
Sure, next time I bet she will drive right by. I would be annoyed, though, if I stopped somewhere for the first time and found no posted prices. That’s just a weird way to do business in most places.