Question: What is the best and most frequently used way to say 'value for money' in Spanish?

Answer: 
In Spanish you would say that something

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> Tiene una buena (o mala) **relación calidad-precio**
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> 'El mejor valor por su dinero'. ('the best value for your money')
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It's so commonly used by Mexicans that is often abused by advertisers, marketers, and retailers all over Mexico to the point that it sounds cliched