My usual response to this question would be to ask you to define "good". But the simple answer to your question is no.
Absent subsidies (from an employer or taxpayer subsidies) the only kind of health insurance you can buy for $20 per month is a supplemental insurance plan.
Examples would be accident only coverage or possibly a nominal hospital indemnity plan.
There is no $ 20 Health Insurance. There are $ 300 ACA Plans with a $ 280 subsidy where the individual pays $ 20 a month. Big difference. If it seems too good to be true investigate thoroughly before giving someone your money. Speak with a local agent that you can locate when you have an issue.
Absent subsidies (from an employer or taxpayer subsidies) the only kind of health insurance you can buy for $20 per month is a supplemental insurance plan.
Examples would be accident only coverage or possibly a nominal hospital indemnity plan.