"How much is that one?"
The price of a fitted kitchen depends on the dimensions, the doors, the worktop, the appliances. You know that, the passer-by does not. They see an oak island under the spotlights and come up with their own figure, often too high. They do not come in.
You choose the answer. You can give the price of the model as displayed, a starting price for a standard run of units, or no figure at all and explain that a quote follows a measuring visit. The assistant sticks to what you wrote. It never works out a price itself.
Either way, it ends with the same offer: leave your name and phone number for a design appointment.