First off,
Welcome to ECN!
Personally, I would have thought something like a supply house would be your first port of call?
Just one thing to be aware of, buying things like circuit breakers on-line opens you up to quite a bit of liability,
whereas, if you get them from a store, you usually have some sort of "come-back", should the product be found to be faulty or even worse counterfeited.

Cheers,
Mike.