Are there any costs related to the rapid COVID test? Returning to NY and new rules state that I need to show negative results, test should be done 3 days prior to traveling

No cost for rapid test. No appointment required, either. Just show ID and insurance card. Fill out paperwork. Best time to go is morning, less busy. They are open until 7pm weekdays, 5 pm weekends. Last Covid-19 test done 30 minutes before closing.

If you have insurance it's billed to the insurance if you have no insurance it's free

You should call them directly. They may accept your insurance