Does anyone know how much an ambulatory electrocardiogram costs?

My chest is occasionally (like a few times an hour) hurting and has a tight, fluttery feeling. This has been going on for a few weeks and been getting worse so I called my doctor and she said to contact a cardiologist for an ambulatory electrocardiogram. As an uninsured college student, this means money I don't have so thus a payment I don't desire. Does anyone happen to know how much this costs?