Electronics

DS have become less useful for some/certain gadgets and gizmos over recent years, focussing very much on consumer goods. Jaycar still fulfill the gadget role and supply up&down the country from stores and mail order.

Here's something they have, looks quite reasonable,

http://jaycar.co.nz/productView.asp?ID=MS6146

other interesting links are;

http://sites.google.com/site/ema1powermeter/standby-killer-vampire-elimi...
http://www.sustainability.govt.nz/goal/save-on-power-bill
http://www.goodsteps.co.nz/catalog/P394_EcoSwitch.html
http://www.righthouse.co.nz/

Righthouse used to market standby switches, hard to tell from their website if they still do - they could be worth contacting though.

Just be aware that some "energy saving" devices are no more than a clever reminder that something is on, and a more convenient way of switching off instead of performing contortions to get behind media centres etc to reach switches or power boards. That in itself is a useful feature though!