A typical household goods store. The city needs one. Something at a good price. The product is at an affordable price. Three prices are not required, but the name is fun.
The classic chain store has Three Prices. If you need inexpensive things for your home or household supplies, you can look here. But still, I think it's worth understanding that often too discounted items may not be of particularly high quality. If, say, it doesn't matter to buy a mug or socks, then for example incense, shampoos of strange brands and so on, I still wouldn't buy, but this is a classic problem of discuanters and similar fixed-price stores