The Apple MacBook 12 Inch retina is normally $1999 on Apples website and on the Kogan eBay store it's listed at $1803.99 combining that with the CTENOFF eBay discount, you can have it as cheap as $1623.50 delivered, last I checked they had all colours in stock of the 256GB.
The 512GB MacBook which I think is around $2499 on Apples website, is listed at $2164 for the Rose Gold colour and that combined with the CTENOFF discount gets you to $1947.60. They have all colours last I checked in stock, although the prices vary a little with each, but not by much.