To find affordable health insurance for your German Opportunity Card, compare private travel health insurance plans online from providers like DR-WALTER (PROVISIT VISUM) or use an online service like Expatrio or Feather, which are known explicitly for meeting visa requirements for German opportunity card applicants. Look for plans with a coverage amount of at least 30,000 euros and a long duration to cover the visa process and initial stay. Once you get a job in Germany, you can switch to the mandatory public health insurance system.