There are many international travel sites out there are having promotions to all airlines. One of them is the most popular and the world's leading carrier, Singapore Airlines.
There are money saver packages where when you book hotels together with Singapore Airlines, the rates are lots more cheaper. For example, staying at a four star Hotel Jen in Hongkong, flying with Singapore Aiirlines can cost you less than $700. You may wish to check them here.
If you decide to go to Perth with Singapore Airlines, you can get as from $906 inclusive of hotel stay for 2 night of twin sharing room of your choice. Grab this offer before they change the price as spending money wisely for travelling is a must.
