I cant find any links with the info, however at Woolworths in Tasmania, and presumably elsewhere, if you purchase the 12x mini tub Calciyum yoghurt (1.14Kg total) featuring the Wiggles or Toy Story on the packs (combo of Strawberry, Vanilla and Banana flavours) you get a bonus chiller bag whilst stocks last.
The chiller bag is small… fits one yoghurt tub, or a quartered sandwich, comes with a spoon, and if you pop it in the freezer for 6 hours, it will keep cold for 5 hours. Ideal for school lunches methinks.
You can buy them seperately from Woolworths for $4.99
The yoghurt is $6.68 normally.
Today there was an advert in the Mercury (Hobart) for $5
However when I went to the Campbell Street and Kingston Town stores, it was still scanning at $6.68, so they checked the ad in the paper and I got it for free (and the chiller bag) as per their store policy ;) Not sure if that was a one day special price, or local only, but the tubs go on special reasonably regularly at around that price.
Here's a (poor) pic of the bag so you can get an idea…
http://i1167.photobucket.com/albums/q621/Mamphatoo/DSC00779.…
Been on a while… Our woolworths has had the little chiller things but been sold out of the yogurts every time!