Must use hotels.com and not hotels.com.au You'll need to change the country to US and currency to USD.
T&C is below:
This coupon is valid for bookings made with PayPal.
Use this coupon to get $40.00 off the price of your booking at a participating Best Price Guarantee hotel when you stay between 1 and 28 nights and spend a minimum of $300.00 for your entire stay.
You must pay for your stay when you make the booking. The discount only applies to the first room in the booking. You’ll need to pay the full price for any other rooms. The discount doesn’t apply to any taxes, fees or additional costs.
To use this coupon, you must be over 18 years old and resident in the United States. You may only use this coupon for bookings made between 12:01 am MT on 11/01/16 and 11:59pm MT on 11/30/16 on the US version of Hotels.com for a stay to be completed between 11/01/16 and 04/30/17. Bookings are subject to availability and the hotel’s terms and conditions.
This coupon can’t be used for:
1. Package bookings i.e. hotel + flight
2. Bookings made through Group Travel Services
3. Bookings paid for at the hotel
4. Bookings paid for in a foreign currency
5. Bookings at non-participating hotels
6. Bookings made prior to receipt of this coupon
Go to http://www.hotels.com/page/hotel-exclusions/?pos=HCOM_US&loc… for a list of non-participating hotels. Participating hotels are subject to change at any time.
You can only use this coupon for a maximum of five bookings and each time it must be used in full. After those five bookings you won’t be able to use this coupon again, even if you cancel one or more of those bookings.
This coupon is only valid for the first 9800 bookings made by all customers using this coupon. You’ll be able to check that it’s still valid before completing a booking. There’s a limit of one coupon per booking.
This coupon can be combined with discounted prices on Hotels.com. It cannot however be used in conjunction with any other promotion on Hotels.com, whether offered by a third party or otherwise.
You can’t collect or redeem Hotels.com® Rewards nights when you use this coupon.
You can’t apply this coupon to taxes, fees, or charges including, without limitation, extra guests, phone calls, cancellation fees, parking, or other charges. You must pay these charges when you make your booking, or directly at the hotel.
You can’t redeem this coupon for cash, and it can’t be transferred or sold.
It’s void where prohibited by law. Improper use of the coupon by you is prohibited and could be construed as fraud. We reserve the right to change or withdraw this offer at any time and to cancel any bookings made where the coupon has been used to make any speculative, false or fraudulent bookings or any bookings in anticipation of demand.
Usual booking terms and conditions apply (see hotels.com/customer_care/terms_conditions.html) and all bookings are subject to availability.
Hotels.com is the promoter of this offer.
These terms and conditions are governed by and construed in accordance with the laws of the State of Washington.
Gee some of the hotels are much more expensive on hotels.com than going direct through the hotel.. or almost any other site heh.