The easy answer is : there isn't one. Now, I should explain: For each usage profile you would find that the cheapest screen is different. If you need a high reolution, high performance, color accurate, high refresh rate (for accurate graphic work, for example) then you would pay a lot more then if you only need the screen for writing documents on word. You should choos a screen that fits your usage profile and needs, read reviews and then decide.
Just remember: the cheapest is not always the cheapest. Sometimes cheap means bad service or bad quality. Maybe you will find that your needs will change in the future and you will need to buy a new screen.
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