Now available in Australia - the compact noise:bit, enviro:bit, and 28-LED RGB Shim. These are compact sensors and an amplified speaker that fit directly to your micro:bit, and a super-slim shim for your Raspberry Pi!
Get the BBC micro:bit scroll:bit and pin:bit accessories in Australia from SmallDevices now - even more multicoloured lights and compact pin access! Great documentation available too: from the fine folks at Pimoroni.
There's a range of different leads and prototyping boards for the BBC micro:bit - this post walks you through from the very basic to the more elaborate, and explains when you might want to use each type.