Noticed these in my local Big W, way cheaper than any other mattress in a box arrangement, would be interested to see how they compare.
For $99/$149 can't really go wrong.
Single: https://www.bigw.com.au/product/mattress-in-a-box-single/p/662537/
Queen: https://www.bigw.com.au/product/mattress-in-a-box-queen/p/662538/
These are unfortunately not available to be purchased online yet so can't take advantage of the $10 off.
Product features:
Queen bed
Soft knit polyester white fabric cover
Generous layer of soft fillings provides comfort and support
Comes rolled up in box
Easy to transport
Medium to soft support system
Recommended for use on slat base
Perfect for back, tummy, or side sleepers
Rotating recommended on a regular basis
Tempered steel bonnell springs
Recommend using a waterproof mattress protector
Ready to sleep on in 48 hours after decompression
Once unpacked you CANNOT put it back into the box
Measures: 18cm (H) x 153cm (W) x 203cm (D)
Weighs: 26kg
Package measurements: 29cm (H) x 29cm (W) x 160cm (D)
Single bed
Soft knit polyester white fabric cover
Generous layer of soft fillings provides comfort and support
Comes rolled up in box
Easy to transport
Medium to soft support system
Recommended for use on slat base
Perfect for back, tummy, or side sleepers
Rotating recommended on a regular basis
Tempered steel bonnell springs
Recommend using a waterproof mattress protector
Ready to sleep on in 48 hours after decompression
Once unpacked you CANNOT put it back into the box
Measures: 18cm (H) x 92cm (W) x 188cm (D)
Weighs: 15.5kg
Package measurements: 29cm (H) x 29cm (W) x 100cm (D)
I don't think that you can expect much from these.