You need to have symptoms.... otherwise it costs. Nobody has symptoms now and over pesach we had to pay$200.
Symptoms or exposure is required in order to get tested, but the testing is free. Perhaps it’s possible to get tested for $200 privately as well. That is exactly the same as the vast majority of the US right now (which is only conducting ~500K total tests a day) and presumably the world.
No, you can’t just get tested if you like brain-picks. Outside of NY and NJ, you’d be hard pressed to find a place that you can.