Was looking for a cheap modem for going away this week and saw this one at Woolworths in the app at $9, which according to Woolworths is half price off the normal $69. I was never any good at maths, but even I can tell that's wrong.
Anyway, seems to be some stock around at a few stores - you can see if your store has stock here or in the app as per the screenshot. There wasn't a card with the other phone\mobile cards to take the counter, a dummy on display or even a tag for it in my store, but I asked at the express checkouts\service counter area, and they had it in the cupboard with all the other mobiles. So if it says your store has stock that might be your best bet.
I'm not sure if this is included in the current Optus Double Data promo that they are running on the prepaid wifi modems on their website (I haven't activated it yet) but if so, it makes the deal even better.
Also, in the true Ozbargain spirit, a few Officeworks stores ostensibly have them in stock, if you want to try and price match… no judgement here ;D
does the 15gb expire after 28 days?