Search for testing centers that specialize in iimagery.

You'll need a script/order but they should be accepting of cash/debit/bank orders.

Edit: this place in PA used to accept cash. Also, it's PA, everyone will accept cash due to the Amish and Mennonite communities. Holy Spirit Imaging Center +1 717-972-4900 https://maps.app.goo.gl/tkAb8JQ4KTfFZtRY6