I have been struggling with migraine headaches and was told to see a neurologist but don't have any health insurance how much does one cost?

Neuro. This is very variable. Some will allow for payment plans, some require up. Front payments. Average consultation i would estimate $150-$200.
Hard to say. The costs of neurologists vary throughout the usa. You may have to balance the initial costs vs ongoing costs if you continue to have the migraines. Maybe the office can work out a financial plan with you.