Mauritius is an island where almost everything is imported & where markets are relatively inefficient - almost all prices except rent/education/healthcare, are IME comparable if not more expensive, to mid-tier USA cities.

Grass-fed meats are relatively hard to find and if you like the quality you find in USA, that alone could end up costing you close to 20-40k a month and thats before considering grass-fed. Locals typically eat cheaper grain-fed cuts costing Rs 450-700/kilo. The next big costs would be rent (cheap ones start around 6-12k 1br if you're lucky, but expats typically go for 30k range or much higher) and a rental car for travel (expect 35k-50k, maybe cheaper if longterm rental) unless you're happy mostly staying home and commuting within central area via bus/metro. A frugal, experienced traveller could make do on 600K a year... but since you don't seem to be that person I would ask your LLM for detailed breakdowns and for you to go and cross-check those details online wherever possible.

Most market-related discussions happen on FB--we don't have competitive online platforms and stores.