Ridio shock is too expensive.
There is one shop in bank st, between gilmour and Gladstone, on the west side, name is something Dollar Bank.
They got severl different adaptors, all depends on how much power your electrical instrument requires.
Note:: it is important to notice the power, otherwise ur things might got burnt. Say, i brought one clothing drier, it is 600W, too much for any adaptors, so now it is of no use.