EKO Wi-Fi Power Plug with Energy Monitor and Timer $10.50 + Delivery ($0 C&C/ In-Store/ $65 Spend) @ BIG W

Save 30% Was $15.95.

Probably one the cheapest wifi plug with energy monitoring that has AU safety standards and local store warranty.

Oh, and yes it is slim. You can fit two of these side by side in a standard double power point.