Coles - Buy 3 Nestle BAKING Products, Get 1 FREE Personalised Kid's Apron
This is the offer in their catalogue.
I have tried to capture it and will post the picture below.
I thought it's a pretty good deal, as the aprons are personalised.
You have to send in to claim it, obviously.
Cheapest product is $2.41 (Condensed milk). So if you only want the apron, you could buy 3 of these then donate the unused ones to one of the Christmas fundraisers at the end of the year :p
p.s. I am not sure if it's only available at Coles, but I will assume so. I will link it to their current catalogue.