On my hunt at bunnings for the Nu-Tec Powerboard I came across the Karcher window vac which I've been eyeing off for a little while. A friend recommended this a while ago and has a rather large house and said it is more than enough, thus not to worry about the NSCK or other more expensive versions as this does the job very well and then some!
Bunnings had them reduced to $119 so the OzBargainer I am wanted to refresh my memory and do some googling, to which I found The Good Guys currently have them for $98. Reasonably good price but the price match makes it a great buy in my eyes.
Price matched at Bunnings yields a final sale price of $88.20. Of note, bunnings also have the Black version but this didn't affect the price match in any way.