Missed out on the DS, MacBook Air deal on the weekend, but got the email from DWI. That's just over 20% off the AUS RRP ($1599). Being DWI, it should be a gray import and ineligible for TRS, although I assume macbook's warranty is international.
I recall some ozbargainers apparently had some bad experience with DWI but I never had a problem with the few purchases I made in the last couple of years.
Plus Import Duty and Taxes if they send it from OS
http://www.customs.gov.au/site/page5549.asp
From the DWI T&C's