Senheng, Harvey Norman and other chain stores are all expensive.
But you will notice some trend, Harvey Norman is going for high class, so they don sell cheap stuff, cheapest digital audio coaxial is 138, WTF.
But at least they have better customer service.

Sen Hing and many other china man chain store only try to sell cheap stuff with expensive price to outstation people. KL or selangor people shop a lot and knows all prices, so they cannot cheat them.

But if I were from ulu ulu area, they will try to sell RM300 hdmi cable to uncle , auntie there.