Saw this ad in my local newspaper - Free Unlimited Delivery at Woolworths
This appears to be an opening special for the Adelaide (Rundle Mall) Woolworths store. Offer is valid until 10th July 2010. Save $5-13 (depending on time slot).
Plenty of delivery slots sill available but unsure how many Adelaide suburbs it is valid for. No codes required - I registered my address and in the 'Reserve a Delivery Window' page, it shows up as $0.00 for all slots until 10th July.
To view the ad, go to http://digitaledition.messengernews.com.au/ It is on Page 12.
coles online has free delivery until 10/7 in SA as well.