Welcome, Luis!
I used to buy & sell about one car a year since I was 16. Always about 10 year-old "as-is" specials from dealership bone yards, or private sales.
Fix it up, clean it up, drive for a year or so, then sell it!
I usually made a few hundred bucks per car, which works out to a couple of decades of transportation for "free" (not counting my time, but the skills learned are priceless).
Where are you finding your used Mirages? I don't live in a big city, so don't have access to auctions.
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)