Target is one I can think of off the top of my head. They have extremely low profit margins, in the realm of 3%. So you know that you are getting pretty much the best price they can offer you when you shop there based on what they are paying and the overhead of running their stores.
In terms of making lower margins than Apple though, that would be basically anyone. Apple's margins are INSANE. The only companies that see margins as high as they do are software companies, and then only a few. No other electronics manufacturer is even close.