Koala Mattress are doing a EOFY sale for those who are looking. They are very popular "in a box" mattresses which have a quick delivery and a great return policy (3 months).
Seems like it's 15% for most items like mattresses and bed bases and 25% for a few selected sofas.
Queen $892.50 (down from $1050)
King $1062.50 (down from $1250)