The correct superlative form for the sentence is 'los más', indicating the most extreme or exceptional comparison.
La tienda Avalón tiene los precios los más bajos del mundo.
In this sentence, the correct superlative form to use is los más, because it refers to the lowest prices in comparison to all other prices around the world. The superlative form los más is used when comparing something to all others, making it the most extreme or exceptional.
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