Was looking for a gym / fit ball as a replacement, came across this special.
Seems they're overstocked this month…
http://www.fitball.com.au/specials.php?cat_id=3&prod_id=110&…
75cm size and only in Yellow / Green.
EDIT #2
Rated for 300KG
KMART is rated to 100KG
BigW doesnt state its rating ( would assume its closer to 100 than 300 )
</EDIT2>
Have at it.
[Edit #1]
BigW alternative, $12 instore…
https://www.bigw.com.au/product/dunlop-gym-ball-75cm/p/WCC10…
Big W have the Dunlop gym ball 75cm for $12 as standard pricing, the P&P of this one.