Hilton has several sale going on for the Asia Pacific market (Australasia, Greater China, Japan/Korea/Guam, South East Asia & India/Indian Ocean).
Hilton has a separate HiltonHotelDeals.com website (access here) where these rates are highlighted.
Here are the sales across the region:
Australia, New Zealand & South Pacific
Mainland China, Hong Kong & Macau
Conclusion
Hilton has been quite aggressive lately with their sales and now have this new website (HiltonHotelDeals.com) highlighting the sales going on in the region.