Tim wrote in (yes, again):

Cheap digital photo development:
Past winner – Harvey Norman at 33c each
Found Big W today – 20c each!

20c is the in-store price, i.e. you need to bring in your own media, and use the self-service to do the printing. Alternatively, you can also use Big W’s on-line service to upload photos, at a higher cost of 31 cents. And you still need to pick it up from the shops.

Thanks Tim!