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Yep fair enough, I only know because I’ve lived elsewhere. I’d reckon there are tables somewhere, but off the top of my head I can tell you some of what you can take duty free into Mexico as part of your personal allowance, new or used (this list is not advice; also not declaring items intended for sale will get one time in a Mexican jail, where beds and personal safety aren’t guaranteed)-
Reasonable amount of clothes for the trip in or abroad (say, 2.5 costume changes a day?), 2 cameras, 3 mobile phones, 1 GPS, 4 fishing rods, 30 CDs, 10 DVDs, 1 gaming console, 5 video games, 1 blood pressure monitor, 3L booze, 6L wine, 1 set of hand tools, 1 pair binoculars, 1 telescope, 2 musical instruments. Plus $300 USD worth of other merchandise most of the year.
Yes it is but I think you’ve misunderstood. Some countries do let you buy loads of stuff for yourself on holiday (ex., in the UK) and take it back without an import charge.
Edit to add UK relevance.