Bought a 128 GB microSDXC card for $99 from JB HI Fi. This is a class 10.
It's marked in the store at $157. However, it's advertised online for $99 and they honoured that price at the checkout.
Obviously you can buy these cheaper on eBay but I strongly encourage you not to do so. I've bought about 3 and each one has failed. Completely useless. Spend the extra couple of bucks and buy it retail.
Office Works also said they can price match this but unfortunately, they only stock up to 64 GB.
What about futu ebay sale?
eg:
http://www.ebay.com.au/itm/Sandisk-32GB-64GB-128GB-200GB-Ult… (?same card $58.40)
http://www.ebay.com.au/itm/Samsung-128GB-Evo-Micro-SD-Card-S… (Samsung option $60)