Seems to be part of the Myer Super Saturday sale. These glasses are great for enjoying many types of beer from but they're specifically designed for drinking IPA (India Pale Ale).
I did a price comparison with a few other stores:
$39.99 for two glasses @ Dan Murphy's
$69.99 for the buy 4 get 6 deal @ Kitchen Warehouse
Average price on Amazon US looks to be around USD$50 + shipping
Other Spiegelau beer glasses are also on sale if you search the Myer site but this set looked like a particularly good deal.
I have these, they get great reviews, but placebo effect anyone?