The cheapest I found for an Asus Zenbook with a pretty good specs:
13.3 in HD LED touchscreen (1920 x 1080), 10-finger multi-touch support
Intel Core i5-6200U 2.30 GHz with Turbo Boost Technology up to 2.80 GHz
Hard drive size:
Windows 10 Home, 64-bit
3-in-1 card reader (SD/SDHC/MMC)
ASUS SonicMaster technology
Intel HD Graphics 520 with shared graphics memory
3 USB 3.0 (1 charge) • HDMI • Mini DisplayPort • Headphone output/Microphone input combo
3-cell 50 WHr (up to 7 hours)*
802.11ac/ac/b/g/n; AC 7265
12.70 x 8.80 x 0.70 in (322.58 x 223.52 x 17.78 mm)
3.23 lbs (1.46 kg)
Model number: UX303UA-C4037T • Backlit keyboard
For more technical specifications, please see manufacturer's website.
**Get up to 25% cash back - terms & conditions: Offer valid from AEDT 12:00am on 14 January 2016 to AEDT 11:59pm 21 February 2016, while supplies last. Available in Microsoft retail an online store in Australia only. Only open to residents of Australia 18 years of age or over. Register your redemption details at www.microsoft.com.au/PCcashback providing your proof of purchase before 6th March 2016. Cash back will be deposited in your nominated bank account within 60 days of receiving your redemption registration. All claims are subject to a verification check by the Promoter. Additional limits and exclusions may apply. Not valid on prior orders or purchases; cannot be transferred or otherwise redeemed for cash or gift cards. May not be combinable with other offers. See store associate for details. Refunds will take into account the discount. Void where prohibited or restricted by law. Microsoft reserves the right to modify or discontinue offers at any time. Limit three (3) per customer. Academic 10% offer may not be used in conjunction with cashback offer. Offer excludes Dell XPS 15 and Lenovo Yoga 900.
More laptops on sale here.
(thanks to cDNA)
1. Via Cashrewards (thanks to cDNA):
$1335 after 4% cashback. Pretty sure cashrewards will track the purchase price ($1599)