Big W - Weider Speed Pack Weights 10kg for $48
They are on sale at Big W for 2 weeks for $48 (half price).
You can dial up the weight you wish to lift from 2kg to 10kg.
If you have already enough weight to lift around your place there are several other great deals that are appropriate for this leg of the Buckscoop Olympics, including a multi-exercise bench or a foldaway treadmill for $68 each.
These should keep each of our 'friends' in top/peak condition.