Test the dictionary before buying it. If you know some Mexicanisms and want a dictionary that covers Mexican Spanish, check to see if the dictionary has them. Check mitote for example. A dictionary that
doesn't have that word may not cover Mexican Spanish well.
RAE is very comprehensive, but try to find mofongo, or Latin American
uses of ojalá or de pronto. You won't find them there. More than one dictionary is necessary.
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