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.
Their stores and shops in the market have fixed prices and I don't know why they have chosen to put a price tag on their product I don't even know if there is legal backing when it comes to stores and their prices and the only place I think you can price is when you go to the market that is like the only place you can be able to price the stores have their price tags on their products so you don't need to be told on what exactly what you want to do.
There are some places you enter to buy clothes you won't be able to price, and they will tell you that it is the company's policy. There is nothing you can do but to buy. Most of these supermarkets are established in an expensive environment. They will need money to be able to pay for their shop, which is one of the reasons why they want to give price tags so that they will have a specific amount of what is coming in.
I don't blame them. It's business, and everyone will do what favors them because they have the capital to bring back. They also consider what they will get in return. It is very simple: if you can not afford it, let it go and go to other places.