Cost of going to Health Clinic without Health Insurance

I currently don't have health insurance because my dad just lost his job and he's in the process of moving to a new job. I also think that I have bacterial pneumonia because someone on my floor had it and I'm experiencing the same symptoms. With that, I know that I'll need a check-up and an antibiotic prescription. Is it possible to pay for this without health insurance and how much would it cost?