Google found most Case Report charge close thousand dollars to get publish if accept. Is this true? Do you pay yourself after submit Case Report to a journal?
Only a few dont require a article processing fee (APC). One that comes to mind is BMJ case reports.
They do charge a fee though. It's not a traditional APC, but you have to be a "fellow" with an annual fee. It's not a bad deal compared to other journals as a "fellow" you can publish with them for the duration of your annual cost. Their website is down at the moment, I don't remember how much it costs.
I agree with @pbrocks15 . Just try to find a journal in that is indexed in scopus or emerging-SCI. Better try to find cost-free or low-cost. Just be careful against predator journals. In these days they are really common, unfortunately. I hope your case report will get published soon. I think reports are very helpful, some of them affects our practice more than bulky data analysis.