Losing employer insurance, where should I look? - 6 months and counting

My family's coverage ended with the layoff and we have a prescription we cannot skip. I am in Jacksonville, in case local advice matters. I do not want a gap in coverage. How fast did coverage start?

Losing job-based coverage usually opens a special enrolment window, so check the deadline on the official marketplace site. I missed it by a day once and regretted it.