Well, 100A circuit breaker boxes with 20 spaces, including 5 breakers,

go for $52 here in the USA. ...


Well, it's not the cost of the box and breakers. It's how much juice is coming to it which is at issue. If I can get away with running an extra line or two from the courtyard box, I'm in good shape. If I need to run more wire from the main building, then I'm looking at bonfires of money.