Just heard a radio ad about these offers, no mention on expiry (the ad suggested it might be an summer-long offer), there is also no mention of the offers anywhere online that I can find. Pretty good prices considering it's from a servo, especially for the Dare Cold Pressed Coffee, which normally goes on special for $2.50 at the major supermarkets.
Can confirm that this promo is also running in Sydney. I've been stocking up on the Dare cold pressed coffee. It's a bargain for $1 and is relatively low in kilojoules (compared to other milk iced coffee varieties). Thanks OP.