At least here in the Netherlands the minimal, obligatory package is about 100 euros a month. this is with 375 of own risk (doesn't include doctors visits). This package will basically make sure you'll never get a real surprise, except when you have something with your teeth, oddly. Some cheap drugs are not covered. And for example there are sometimes discussions of whether new immuno-oncology related drugs that go well over 100.000 a year per patient will be in this package.
For people with low income there is "zorgtoeslag", they get sponsoring from the government.