Have been looking for some holiday package deal in late April or early May to Bali.
Came across this amazing deal for Kids Fly & Stay Free from Jetstar.
^Club Jetstar Early Access ends 10:00am AEDT Wednesday 29 January 2020, unless sold out prior. Public Sale ends 11:59pm AEDT 5 February 2020, unless sold out prior. One child (0-11 years) per full paying adult, can fly and stay for free (when using existing bedding). Includes return Starter airfares to Bali (Denpasar), excludes checked baggage. Selected travel dates apply. Terms and conditions apply.
~Club Jetstar has an ongoing annual membership fee of AUD $55. See the Club Jetstar terms and conditions for more details. The annual membership fee is non-refundable.
Eg Hilton Bali Resort
https://www.jetstarholidays.com.au/SYD/DPS/DPS33683/33683?departing=2020-05-02&returning=2020-05-08&groups[0][adults]=2&groups[0][children]=2
Trip total $4,408 (Per adult price $2,204)
However, with Early access for Club Jetstar members!
Trip total $3,218 (Per adult price $1,609)
I copy and pasted the link you used, 2 adults and 2 kids and changed it to 2 adults and 1 kid and its cheaper? Same room, same hotel, same dates, same city. Thought kids fly and stay for free.