What is your recommended rolled up mattress to buy (Australia)

Hello,

Looked up so many mattress reviews. To the point where I have no idea what to buy.

Its going to be a double bed due to size restrictions of the room. Will sleep on it 1-2 nights per week. Want a good bed that will last for 10+yrs and won't sag.

Looking at spending less than $1000. Any ideas or personal experiences? Please help!