Coupon received at checkout in store when I purchased over $30. Stacks left at every cashier. Can be used immediately with the current transaction, and re-used in store until 19 Sep 2010.
Confirmed usable for weekly specials and clearance items. Further 10% off discounted prices.
Haven't checked with neighboring Coles stores. Suspect only Caringbah NSW store with this offer. Probably trying to fend off customer defection to newly refurbished mega-Woolies across the road.
T&C: http://upload.ozbargain.com/2010/08/27/4322_coles_back.jpg
Im not sure about this, but i believe Coles Merrylands have a similar sought of discount scheme for purchases over $30 or $50.