France:
- Rapid test (antigen test by a professional): free in most cases, 22€ otherwise, usually easy to get tested the same day, but lines can be sometimes long if you don't have an appointment
- Self tests: 2-5€, often out of stock.
- PCR tests: free in most cases, 44€ otherwise, may take a few days to have an appointment, plus a day for the results
Anyone can get tested for any reason, but contact cases, prescriptions, and people with symptoms are supposed to have priority.
The incidence rate in France is crazy at the moment, almost 4000, and while I will not say today is the easiest time for getting tested, if you want, you can. If anything, such a high incidence rate means that testing capacity is not that bad. Positivity rate is around 26%.
Government recommendations regarding testing are a huge mess however. They keep changing, they call for self tests that are unavailable, they are different depending on your vaccination status and age, etc...