>The usual rule of thumb is the cheapest car costs you _at least_ 300 €/month (taxes, depreciation, not counting gas money)!
These prices are hardly uniform across all of Europe. I live in a smallish city in the Netherlands and you can probably own a car for 60 - 100 €/month here.
They're not, that's true. Be sure to count all your car-related expenses, though. Even minor repairs quickly cost over 1.000 € and you'll be racking up a lot of those over the life of the typical car (if you have an older one). For a new car, depreciation runs even higher.
These prices are hardly uniform across all of Europe. I live in a smallish city in the Netherlands and you can probably own a car for 60 - 100 €/month here.