How do they do it? It isn't cheap labor - they have to be getting these components at a quarter the price US dealers are getting them to sell at these prices. The prices are lower than what the manufacturers quote for 1000 piece orders on their websites.
If that American is depending upon a markup of thousands of percent, that's not honest income.
What I am not understanding is why a one-source component like the MAX7219CNG can vary so much. You would think Maxim could control the supply chain such that this would not happen.
You don't see Intel processors costing 75% less if you order them in Asia.
You would think that these parts would be tested prior to inclusion in these mega-expensive systems.