The answer to the price of a circuit breaker is that it can vary widely depending on several factors. Circuit breakers generally range from $5 to $200 or more, depending on the type, size, and features. Factors that affect the cost include the amperage rating, number of poles, whether it's a standard or GFCI/AFCI breaker, and the brand and quality level.
For most residential applications, you can expect to pay $20 to $100 for a standard 15-amp or 20-amp circuit breaker. Specialty or high-capacity breakers will be on the higher end of that range. It's important to get quotes from local electrical suppliers or licensed electricians to determine the exact cost for your specific needs and location.