This insane gouging can be thought of a "tax" for people who won't spend 2 minutes reading their owner's manual or researching an issue.
Had you read the owner's manual, you would have know exactly what was required, which is nothing more than an oil change and cabin/air filter.
Total cost in the Bay Area around $200.
Had you spent a few minutes researching your "light blinking" issue, you would have immediately found that the battery was the likely culprit. You could have went to auto parts store, where they would have tested your electrical system for FREE and installed a battery for FREE.
Total cost around $150.