I have never seen any shopping mall or business that does not allow consumers to bargain, they just refuse to bargain with us and they have the right to do so.
Of course there are stores that have fixed prices to their products and you cannot bargain. In my country, the most places where you can easily bargain a product being it a foodstuff or any other kind of product like clothing, is usually in the market. Then few stores around the town. Malls and Supermarkets will have a fixed price tag to their products at all time so you cannot bargain. Instead what I am always advocating for is for government to find a way to regulate the prices of these products and commodities within the marketplaces, the shops, malls and supermarkets.
Or just wait for the time where those malls and supermarket offers sales or discounted prices where most of the time will happen each clearance day period, there are different ways to manage some savings when purchasing products you just need to be wise and always being active, if you have enough time then better to check first those available stores before buying so you'll know whose offering discounts or which store offers lower prices.