I found Techno Gears Marble Mania Mine Shaft Ultimate collection with 400+ pieces for $39.97, it used be ~$50. In comparison it's a better deal for this than the extreme collection at $49.99 http://www.ozbargain.com.au/node/87442
Another good deal in my opinion is Puss In Boots for Xbox kinect at $14.97. the cheapest locally I found was $30 at Jb hifi. I did a quick search online, the reviews seems mostly positive.
here's a photo taken from my phone if anyone wants proof http://upload.ozbargain.com/2012/12/19/10173_20121217_140815…
I think they quite good deals if anyone's looking for last minute gift ideas.
but not $29.99 at aldi - http://www.ozbargain.com.au/node/72579 :)