Hey wildflower. Yeah its crazy expensive, that's why I'm getting sober with free alternatives like SR and AA.
You can do this without rehab, it just takes a strong will in the beginning and the doctor's help if you have bad symptoms. What are your withdrawal symptoms like? If they scare you, just go to the doctor or urgent care. Give yourself a weekend with few or no responsibilities so you can huddle up in pajamas, take baths, eat soothing foods, and just do nothing but not drink.