while I'm on weekend shopping, I found this clearance items at BigW (Campsie, NSW).
Tag shown as $50.01 and at least 5 items available. Product description described as 'Made for iPod' but I believe that is compatibility with iPhone. Hope this help for someone who looking for Micro System around $50.
Also spotted Xtrememac Tango 2.1 Speaker for iPod for $50 as well. http://upload.ozbargain.com/2012/06/09/8629_img_1674.jpg
Does anyone know if it's nationwide or just this store?
And are the speakers wireless?