Originally Posted by GIMH
How do they check you have less than 20 on your card?
A lot of places, usually off licences, do a fiver minimum for cards, but if it's self-serve then card is always allowed, unless they have a cash only one (they also usually have card only ones).
Sorry, didn't phrase it well. Saying that I think, when possible, should use cash for anything less than a $20.
Self-serve at the supermarkets hasn't taken off here as much as Britain. There are some around, but not nearly as many. Think that'll be a bit of a cultural change about using cards more often.