ALDI

Often has good specials on items, limited number and once they are gone no rain checks etc.
The product types are limited and has a lot of their own brand things but they are usually quite cheap.
Sells a wide range of supermarket items but not all are carried, eg. doesn't carry firelighters, denture tablets etc but has their own brand of many things.
Sometimes has specials of branded things, eg. Kraft dip, Vegemite but mainly has their own brands of things.
Good variety of fresh fruit and vegetables which are often very cheap but good quality.
Don't sell any free range meats and seem to get from one supplier.
Go there before doing your supermarket shop and get the things they have at a good price.
They don't pack for you and have no baskets so you need your own bags and because they are very quick on the checkouts, its hard to watch for overpricing/ poor scanning.
I haven't found any mistakes but not sure if that's because none have been made or because I don't pay as much attention as at other stores due to the queue and the percieved hurry.

Approximate cost: $1 up