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Homes less than 10 years old will have a modern type breaker box. As far as cost goes, that is a good thing if an upgrade becomes necessary. In this type of house, the breaker box will be a minimum of 100 amps, and probably have enough available open circuits to allow upgrading without needing an entirely new panel. This type of upgrade can usually be completed between $363 and $1004.
Circuit breakers can be purchased within the $7 to $35 price range depending on the type of circuit breaker. Most companies sell a wide range of circuit breakers that have different power ratings and can be used in different houses depending on the need. For example, the Siemens Q2020 Two 20-Amp breaker can retail for $9 to $11 while the Absolute CIB100 circuit breaker can retail for $15 to $18. One of the sites that sells different kinds of circuit breaker is Plumber Surplus.